another torsion bar question

I have seen alot of post about people wanting to upgrade bars but im not sure if i would need to or not.

I have a 70 swinger origionally a 318 car. I swaped to a 8 3/4 rear with 3:55 gears. Currently i still have the stock rallye rims and tires. I am sticking with small bolt pattern so not sure what rims and tires i will be going to. I am also keeping the 318 motor just completely rebuilding it and planning on 300-375hp. I also plan on only using this as a street car if i do go to the strip it would only be once to see how it does.

Should i upgrade torsion bars? If not is there any disassembly i should do to them like rebuild bushings or anything while the car is on jack stands and completely disassembled?

Any tips on removal and installation never had any other cars with torsion bars
thanks
mark