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Don't waste your money on a cheap or even mid-priced converter like that. Grab a custom torque converter from Precision of New Hampton or other reputable place, and give them all the information about your specific application once you sort it out.

For your final cam specs, I'd order one spec'd by Dwayne Porter before I would guess myself. His recommendation is going to be as close as your going to get to perfection, but then I would send him the heads for porting and a proper valve job too.