Cost of a custom billet ohv cylinder head would be cost prohibitive. At least 4 or 5 times the cost of a new engine. Probably a lot more.
I assume you want to mill the head for a higher compression ratio.
Cylinder heads cannot just be simply ground. Careful measurements must be made. It's possible someone on this forum may have done it already.
Take engine to a good automotive machine shop and tell them what you want. They should be able to answer your question.
You just may change you mind.
