From the "Power Manual"-- Chevy Cars-- '66-'79 250cid without integral head
My 250 has the same casting number, and it doesn't have the integral head. Hope this helps. John
'68 C-10 - 250 with Edelbrock 600cfm 4 barrel, Offy intake, Hedman headers and true duals, HEI, MSD 6A box, relocated gas tank Soon to have: T-5 tranny
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