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Turk,
I'm in the process of a tp project also. The "old engine builder" here has advised me to increase stroke and you can keep the revs down a bit while the tp heads still gobbel plenty of air. He has worked a 391 steel truck crank over to use the large front hub for the 871 blower drive pulley: Will have about 460 cu/in when done. I need a block.
Chuck
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