okay im building a dodge demon that i plan to do alot of drag racing(bracket racing) now heres my question should i do the car underneath in rust bullet. Or just paint it the car will also see a fair amount of street time too

If the underside is generally clean / minor surface rust, just clean, sand prime and paint.
I use and recommend rust bullet; I only used it on areas where more seroius rust was starting to creep....though it does make for good primer!

the car pretty much 100 percent rust free im trying to keep this car light too but it will also be going down a gravel road quite often too my plans are to have seats no carpet headliner all steel body and go drag racing have a 340 that should run when put back togther. The goob took the perfectly running 340 aprt my plan is to put it togther and just have a car to drag race this year