Years ago I had a 71 lemans sport vert that came with a 455. It had a real small aftermarket cam like the summit 2800. It WAS all done by 4000 rpm but with the .308 gear it got 19 on the highway.
Just a WAG but if I were to try to do what your doing I would use the 2800 cam, a performer or sp2p and a set of cleaned up small valve 4x heads. just my WAG.
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72 GTO 400-M20 Lucy Blue
86 2+2 Black
09 G8 GT red
08 Torrent GXP (wife's)
09 G8 ST (UTE) black
A pissed off fat house chimp on dope would be a lot more deadly.
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