i'm not thinking the carb necessarily needs to be bigger, just something other than a Q-Jet. If you've got a 800 DP, I'd give it a try
Your sixty foot on slicks ought to be in the low1.6's high 1.5's range IMO.
if you do buy new drag tires, get something smaller in diameter, 27-28"....with 4.10 gears you don't have enough gear for 30" tire....4.10 is barely enough for 28".
On your launch, do you stall up against the converter as tight as it will go without creep at the start line, or do you just push it up a few hundred rpm above idle to prevent bog and flash into the converter at launch??
Shift RPM?? Finish line RPM, and in what gear??