JimRJ,
Can you give the rear tire size?

On my website is a great gear ratio calculator. It runs using Excel. http://www.12bolt.com/gearing_calculator

I think a TH350 will really help you out. I know last year you did not want to spend the extra money on a intake or trans.

The 200R4 will also help you. The TH350 will be cheaper to get the setup running and be bullet proof. The 200 R4 will definately cost more and be harder to setup if using lockup. The OD trans will not like a high stall converter.

With RPMs over 4K a Clifford intake will help.

Inliner Member 1716
65 Chevelle Wagon and 41 Hudson Pickup
Information and parts www.12bolt.com