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One, lets assume the engine code WY sticker was how the car was delivered.
Two, then assume it has to be one of two possible engine blocks.
Below is a chart from H.O. Racing, since the car was probably built in late 68 it must be either a 68 or 69 coded block. So what choices does that leave you with?
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Since it's a '69 car, it must be a RAV engine. Pontiac must've used the WY blocks in '69 to put the RAV intake, cams, et al.
But to imply that the car came with a '68 engine is well, cuckoo!
