The '66 annual kit engine is carried over from the earlier Jo-Han American kits. The first American kits with engines were the '63s, then the axle hole in the block was altered and the engine used again in the '64-'66 kits. It's the earlier ('56-'65) engine, not the 199/232/258 series. The automatic transmission with those kit engines is the Borg-Warner unit AMC used through 1971; the Jo-Han piece ought to fit with one of the Pacer engines.
For the late Sixties AMC six, the Pacer unit makes a good starting point. The AMT wagon and MPC hatchback are totally different kits, tooled by (then) competing companies. IMO the MPC hatchback engine is the better one. The Javelin would probably have a different air cleaner, fan, and pulleys, and definitely a different automatic transmission.
You'd have to burnish the daylights out of the matte finish foil to change it to chrome finish. Unless you're using some unknown, more rigorous application method, there's no need to be worried about that.
I've actually got an early Fifties Chrysler kit. It was made back in the day by a company called F-B. It's mostly precut sheet balsa wood, with a piece of thick stamped foil (or, very thin aluminum sheet) that you are supposed to cut detail parts from (grille, bumpers, wheel covers). The main body is built up from pieces of sheet material as opposed to being a roughly shaped block like the Berkeley wood car kits. They don't tell you how you are supposed to shape the aluminum foil bumpers without putting wrinkles into them. My kit is incomplete and the instruction sheet is falling apart, but I measured the main parts of the body (the ones that are here) and the thing actually measures out pretty close to 1/25 scale! It's supposed to be assembled as a hardtop, but leaving the roof off would probably be easier. R&R Vacuum Craft may have made a resin body for this car also, but if they did, it was a l-o-n-g time ago. They're out of business too. I did get a couple of pace cars from them in the early Nineties, but even then they didn't have the Chrysler...if they had, I'd probably have bought one.
Looks way too good to be a TKM (resin) piece. I'd bet it's a S.C. Miller resin, probably made in the Eighties. He passed some years back, don't think anyone else picked up his product line. The '48 Ford promo was, ironically, the only cast aluminum piece AMT did. They switched to plastic for the '49 Fords.
It was the original Cragar Super Trick wheels that were made up of interchangeable, spun halves. The Centerline wheel halves were stamped, and permanently riveted together., at least all the ones I have ever seen. Maybe they made some early ones that copied Cragar's design. One of my older brothers bought a bunch of original Super Trick wheels some years ago. I borrowed a couple of the halves to measure for a project. The bolt-together Super Tricks weren't intended for street use, Cragar sold a "street version" that was made up of a steel rim and aluminum center section like their other wheels. The street wheel was chrome plated, heavy, and really didn't look anything like the racing wheel.
I looked at the website first thing after reading about this, and wasn't able to find them there even though HL carries other Molotow products. Stopped at one store this morning, and they had all three sizes on the rack.