Re: 38 heads
The later heads from post war would fit the older engines. A lot of the aftermarket stuff has a different chamber design (crow foot) but most would fit the 59A engines. If it fit a 59A then it would fit any of the early 24-stud types. I don't know about Don Orosco's stuff for the late 21 stud engines. That stuff will likely be available from H&H for a price. All the 24 stud aftermarket stuff should be fine unless it was cast before the war and try to fit a 59A. There is likely not a lot of prewar aftermarket stuff floating around anyway.
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