That motor is a lot to handle for almost every one but the best of the best or with a very heavy truck.
I had one in a home made truggy before any mfg came out with a truggy. 13lbs & 40 series proline tires & still was difficult to control.
I tried a few things that worked OK. 7mm restrictor,086 pipe,short header,heavy(had grub screw in them)alum shoes, 0.9 clutch springs,bigger cluth bell I think 2 teeth bigger than the old os21 used & detune so the motor was soft.
All that helped but when jammin came out with the CRT that motor went in a drawer & never came out again.They did come out with a higher port count that soften the motor some but,Uhh stil too much.