Not Ranked
What heads do you plan on using? 390s had 2.04 and 1.57 valves.
I think you can use 428 heads on a 390 without running in to a problem. You will then have 2.09 and 1.65, which is the same as the 427 LR. I do not think the bore is large enough to support the larger 2.19 and 2.25 of later generation 427s.
Like David said, ask George.
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Bill Malone
Gashole
CSX4786
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