Yes, the earlier style, pre emissions head fits on the newer block, I've been told. Also the heads for 194, 230, 250 and 292 all use the same blank casting, how they differ is in the valve size and spring tensions and types. Could be some milling on the chamber above the piston, but I'm guessing here.
I/I #4101
'71 GMC Jimmy 350, sm465, np205,3.73 posi.
'68 C/10 Stepside 292 (.030 over) Offy Intake, 500 CFM AFB,Clif headers, sm465, 3.73 posi.
'67 K/10 454 project.
'72 K/5 rolling frame project.
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