All things considered, I'd build a RAII-headed 428 for no other reason than parts were available in '68. Sort of a one of none fantasy build if I raided the parts counter in '68. With Pandora's box opened and now looking at my options to solve gripes I had with previous incarnations of the car, I keep having to remind myself this project came about because of the heads.
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Ken
'68 GTO - Ram Air II 464 - 236/242 roller - 9.5” TSP converter - 3.55 posi ( build thread | walk around)
'95 Comp T/A #6 M6 - bone stock ( pics)
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