Beefed up My six, need more power to the Rear

Wcalmt said

Okay I've taken my 225 Slant 6, Bored .60, Head milled 0.100, With Clifford Performance Torq-er cam, and Twin Weber 38's intake, and headers.

Still same 727 trany, and stock rear-end, I don't think I'm getting the power that it's supposed to have though to the Tires/Road.

Thinking of getting the Transmission Rebuild and Shift-kit installed, and need a better 3rd Member...Any Suggestions?

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Well think about it;The stock rating was 145hp. What were you expecting?

The tranny work you are contemplating will not amount to anything, in the power dept.
Whereas a higher stall TC and gears will.They won't make any power, but they will allow the engine to spin up both quicker and higher where the new torque curve is.
Then the rest is in the tune.And a generous weight-loss program.
I once was, where you now are.