RJ,
The 70 and 71 high compression 340's have a 2.02 intake valve. The 72 and 73 low compression 340's have a 1.88 intake valve. I am assuming heads with the 2.02 valve can flow substantially more air than the 1.88 with S/S style porting.
Charlie Walc ran one of the high compression 340's in S/S years ago. He said it was a fun car, but an expensive one.
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