Need help with converter

FYI....
from jegs.com

1. How Do I choose the converter stall speed that is right for my application?
Answer:� Advertised stall speed will need to be at least 500 RPM higher than the beginning of the powerband of your camshaft. All aftermarket camshafts are supplied with a cam card that states RPM range.� If your camshaft states an RPM range of 1500-6500, for example, you would want to select a torque with a minimum of 2,000 RPM stall� For a street car it is wise to also select a torque converter stall speed that is below the engine RPM at 65 MPH to prevent excessive heat build up.

with a tallish tire it would turn 2600@58mph. That doesn't sound too crazy.

Which means he needs a converter with a 2100 or less stall.... see above

With his 3.91, assuming a 28 in tall tire, puts his RPMs at 2491~ @ 65 mph... so again, less than that for stall RPM...

A billet converter with that speed is meant for drag racing. Period.