Living with a 2.21....

I would think 2.76 gears would do it much better and get better milage. A slightly higher stall converter as well. The motor wiuldnt have to work as hard to get it moving. If it were me, i would drop down a few jet sizes on the primaries and a stiffer secondary spring. The HEI is good stuff, but what is the advance curve?
Excellent idea about the TQ. Right now it has one of those lock-up converters so I don't know if any aftermarket TQs are offered. As for the jet sizes: I fiddled around with different sizes for an entire afternoon and found those which are in now, 72/74 work the best. Same goes for the spring. But great idea about the TQ...