just boring wont give to much in gains if any. it can cause overheating if the cylinder walls are to thin. i believe a 302 with a .30 or .40 bore is a 306 but not 100% on that. I wouldnt take a 302 over .40 personally unless it was an older 70's block
if you have to I would try, and get a core block from the junk yard that hasn't been bored yet if it was me. 40 is the max I would consider on a 302 block without sonic testing and even then I would really look into a new block it's not like they are rare or anything like that.
RIP Steve Bricks. FTE will not be the same.
Will be forever glad to have had the privilege to shake your hand and BS in person.
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