I'd guess it would be the tooling investment in today's dollars. The way engines are designed on the current kit runners there's no easy way to just stamp out a few thousand 383s with some stuff over here, some stuff over there, and some stuff on the chrome runner, etc. You'd be talking about making all new engine tools for all of that. Now you could argue that going forward you'd design each engine to be modular enough to be run individually, but I'm not necessarily sure anyone at Revell possess that much insight - or bravery to take that kind of risk.
Well in all fairness to the CYA Division of Revell (Motto - Making You Buy Another Kit to Get What You Paid for the First Time), the only reason the most recent version of the '72 Olds has two grilles is because the original one DOESN'T have two grills and therefore couldn't actually be built as the 4-4-2 as advertised on the box. To boot you have to pay more to get the right grille since there's that resin figure of Linda Vaughn in it.
Beemax posted the built test shot/decal fit today. The two liveries are both Eggenberger Motorsports, the Kamachi is the 1985 Guia Race of Macau winning livery, the other is the 1985 InterTec Fuji Winning livery. 21462344_1457203550981632_7412489462807889861_n by James Duff, on Flickr
Without coming across as a total horn tooter, I'll second what Steve said in that I have the trinkets of proof that a well done OOB Curbside can not only place, but win it's class against full blown kits that were fully detailed.
It's the engine and wheels out of the '30. Make it a more appealing (to some) reissue rather than just dumping the same ole same ole kit back onto the market. At least locally (and it seems like most Hobby Lobbys everywhere, eBay pricing, etc) the '29 was always available on shelves/close to regular price on eBay. Be interesting (and consequently not surprising)) if the '30 has the Buick mill and wheels. I believe Tim pointed out in another thread this tooling is designed to be modular in that respect.
Curbside is kind of an antiquated class at this point. It was sort of a bone throw to import/race/resin guys who were building kits with no engine and minimal chassis detail. But these days very few - if any - contests still allow judges to pick up an entry to inspect the chassis work or look at the engine in close detail. That's why most say if you specifically want your chassis judged you need to put it on a mirrored base. Since nobody is picking up the entries anymore a kit that's curbside in content has just an equal chance to win a regular class. It wouldn't surprise me to see Box Stock/OOB get phased out as well since it really doesn't matter how much effort someone spends in plumbing a chassis, unless they have the mirror base to show it off. One thing that grinds my gears is when Curbside & Slammer are combined into one class. I don't mean to imply offense but someone who spends the time to build an entire kit, interior included shouldn't be judged against someone who spent a couple of hours making a very nice body shell over aftermarket wheels.
Alright so that's 6-10 new parts out of a completed chassis/powertrain assembly of close to 40? I'm glad that the specific differences will be addressed, but considering 95% is carried over I think that's still functionally "more or less carry overs".
The price bump was from all the new tooling that had to be created to merge the drag and NASCAR versions of the two '64 Mopars together. The Belvidere and 330 weren't compatible with each other as designed originally.
Vallejo sells the paints on the wholesale end in boxes of 6 bottles. Based on that the MSRP for a bottle of paint (the eyedropper 17ml ones) is $3.30. That would seem to me that Vallejo has increased it's wholesale pricing since I doubt H.L. was selling it at a 30 cent loss per bottle before the coupon.
I guess I shouldn't be surprised, they've probably had those in development since they could get their hands on a kit to size them. Plus they will be out in two weeks or so giving them at least two months on the market before the Fujimi kit hits the shelves.
Those Lee kits and I suspect the "HKimya" were reverse engineered from the Tamiya kits back when they were new. Tamiya reissued those Mercs about 10 years ago, but the tooling is from when the cars were new in the late 80s. There was no fancy 3D scanning back then, which is why the copies are so crude.