Hello, I have a core set of 1958 Chevy 348 heads. I believe these are essential to the '58 block because of a lack of cooling holes near the spark plugs. Also I will throw in a set of '58 dated intakes. I have an extra crank too if you need that. 3732791 casting # A1658 date code on both heads Any questions please call Nick 512 667-5230 Open to offers and trades! I will be driving to the Austin, TX area from Tucson in the next month or so and I can meet you along that route if needed.