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The 268H or the nostalgia or that second crane recommendation will run fine.
Head work is a real good idea. Bigger valves will help, but smoothing out the bowls after the bigger valves are put in is critical. Your heads will flow worst with the bigger valves if bowl smooth is not performed. Bowl smoothing is the low hanging fruit in cylinder head porting. You can pick up 20 easy hp with this procedure.
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