I’d like to buy a 428. Complete engine, short block or just block. Not a CJ. But, perhaps a 428 from a full size car or wagon. In fact, a non-CJ would be best because the 428 will be going into my 68 Colony Park. Although a CJ would be cool too, affordability is also a concern. Either way, I am in need of a 428 as I’ve found out that my Q code wagon doesn’t actually have a 428. It has an internally balanced engine. Probably a 390. To make things right, I will need a real 428.
I stand corrected. Certainly the '66 and '67 were not the same. I am under the impression that from April 1st 1968 on that all passenger car, Police Interceptor, and CJ (not SCJ) were the same parts, but until I can document that, it could very well be wrong. The C and A scratch were to signify that the block was “A” thick wall cast for boring out to 428 and “C” improved micro-structure nodular iron for the CJ, other wise the cores were the same. I have read that the foundry switched to the nodular iron and never looked back. Again this needs to be documented. The CJ was supposed to be economical to build since it didn’t require special production techniques.
The 428 CJ used a normal 428 rotating assembly. Block, rods, crankshaft, all shared with the typical 428 grandma car. Like you say, the “C” scratch and reinforced main bearing webs were an evolutionary part of every 428 - not specific to the Cobra Jet. There is not a special nodularity for 428 blocks, the same iron mixture was used in the 302 / 390 etc. So that part of the story is simply a myth.