Hey, another S-Code fastback! Cool! Unfortunately, there isn't any visible difference to tell you. Even the casting number on the block won't help you a whole lot. The cylinder heads can give you information since they're C80E's and will have the 16 hole bolt pattern. The funny thing is, and CJ owners are gonna want my head for this, Carrol Shelby himself said the 428CJ didn't make any more power than the PI 428's in the 67 Shelby's. Alot of folks didn't believe him so they did a dyno test. They were virtually dead even.
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