Run as much compression as possible..
If possibble, run at least a 4 spd. 3 speeds gearing sucks a$$.
You are going to need to run low rear gears & do a lot of supension work.
Take out all the weight you can. Drum brakes, with the brakes adjusted on the loose side, but safe.
Get a "SPECIAL" valve job. and some type of epoxy "example: JB weld" to improve the short turn radius.
Is porting allowed but stock volume?
Angle mill the head.
Have the carb nuts loose, so when you floor it the carb will tilt back allowing more air to get into the engine.
You would jet the carb a bit rich @ idle but it will be perfect @ W.O.T. & carb tilted.
Find the biggest "STOCK" 1 barrel carb.
Just some ideas.
Have fun!
MBHD