small block heads, 4027596 casting # any good??

B3422w5 said
Old thread.
Just talked to a buddy who uses 596 heads with 1.88 intake valve.
Car has been 9.60’s with them at 2700 ish pounds on a stock stroke 340.

Obviously a well sorted out and very light weight race car. That’s the kind of weight I’m looking to get to with my ‘71 Duster.