high stall converter on 94 gt

Hey guys!
I have a stock 1994 GT 5.0 convertible - Automatic trans

I recently had the rear end rebuilt, went from the stock 327 to a 373 Yukon performance with a locker.

I've thought about quite a few different mods but figured gears were the best place to start, not quite ready for heads, cam and intake.
I think I should upgrade my transmission with maybe a shift kit and a converter with a higher stall rate.. probably around 3k

Has anybody done this? Am I wasting my money? is there something I should do first?
Looking for more balls, something I can really feel.
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