Re: 38 heads
Later 8ba 24 bolt heads are different.
Talking 59a down... I do a quick check on heads on shows. 3 bolts down the middle 24 studs. 2 down the middle 21 studs.
I think the only thing too consider being a 24 is maybe flat top pistons. Also you will need to replace the lower studs. You could mill the head also.
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