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I was looking at the #'s of an NCRS Top-Flite Survivor '65 Fuelie and am pretty sure it had the F..
It was also a March engine build but earlier in the month and on casting # 3782870 ..

~ Pete
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I like real cars best...especially the REAL real ones!
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I cannot say I have seen a Corvette SBC of the era that did not start with the "F" in the prefix. All Corvette engines came from Flint. Furthermore, I cannot say I have seen a 327 F.I. car that was not on a 870 block. But, there is always a chance. Could you post some pics of the casting #'s and the deck?
Thanks,
Tim