Not Ranked
Go with the IDF's. As Rick says above, give Jim your full cam and engine specs specs. I have 48IDA's on the race 289, they love wide open, not so much the putting around paddock stuff. He will want to choke those down to 44mm, let him set them up. 48's are too large for a small block, on my full race engine they are choked down to 44.
Have fun.
Jim
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