The SM465 would definitely hold the torque, especially with the 5.13 gears.
The RPO MY6 (GM 833) would be an excellent trans for that application.
It would let you even drive it to and from the track at a decent speed.
The best I can suggest is roughly 9:1 compression, zero deck, small port head, with good exhaust and intake.
If you search efi-diy you can find threads on TBI conversions for these, including a way to use two single barrell TBI units, most of which is scroungeable.
While it will make it run better overall, and help with fuel economy, it will run more consistent on the banking.
I don't know if you will be pushing on a track with enough banking to give the carbs fits with the angle or not, but the throttle bodies don't care.
Food for thought.
