Gee Mr Moto, sorry I missed your post from Feb last year. This video is a tribute to local racer who passed away, and the first bit is a bit slow, so jump to 6:48 where the engine features. This vehicle was owned and built by local Studebaker dealer, Bert Needham, and Warren Weldon was the main driver through its racing history. Sorry for the hi-jack. Love the Avanti.
As Brian mentioned, the Arii kit is basic kerbside, no engine or suspension detail. It's a good one for the slot car guys. Tamiya also did a re-issue of their slot car body a few years ago, and pop up on ebay occasionally. It's only the body, glass and flat tray interior, so not ideal for a detailed model, unless you scratch build it all.
If you need to work out other scale dimensions, just divide the full size (1:1) size by the scale. 1/25 scale of 2" = 2 divided by 25 = 0.080" (2.0mm) 1/32 scale of 2" = 2 divided by 32 = 0.063" (1.5mm) etc.
It's a bit hard to tell by the pics, however, the square main side rails look like about 2" (~51mm) 1/25 scale = 0.080" (2.0mm) 1/32 scale = 0.063" (1.5mm) Even if the side rails were 2.5" square, @ 1/25 scale it would be 0.100" (2.5mm) You're probably not going to get the exact size you want, so just go with what's available, and look the part.
As Colby suggests, caustic soda in solution usually removes the plating, so how about masking the rim you want to keep chrome with a 'rubber' mask (eg Parma Fasmask), then carefully brush on the caustic to the area you want to strip. Wash thoroughly to remove the caustic residue. Might pay to test on scrap chrome tree to see how it goes. Caustic is a bit nasty, and is a skin irritant, so best to wear disposable gloves, safety glasses, and do in well ventilated area.
HobbyLink (with a K)in Japan quite often have good specials; https://www.hlj.com/ With HobbyLinc (with a C) in the USA, it can get a bit confusing; http://www.hobbylinc.com Not sure if one pinched the others name or not??? I've bought from both, and both are good suppliers.
Wow... Many thanks for all the responses. Great research and info Bill. I'm not attempting to build a dead ringer on accuracy, but rather a good representation of OY2 when Dan Gurney drove it. I've also found out that these 2 kits might also have the nailhead. AMT - T149. 1940 FORD SEDAN DELIVERY VAN Revell - H1224:200. TONY NANCY 22 JR Roadster & Dragster double kit So, I've got a few choices.