Jeff is correct. '69-up are all pretty much the same with some timing pointer "quirks". Even the lowly 265/301 cover "fits". '68 is unique to itself, in that it uses the earier water pump system and the later balancer. Pre-'64 are different, as well, with a "4-bolt" water pump. Also, as said, they ALL "fit" the blocks. What are you up to?
Jim
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