After all that work, please SEAL it underneath. If you have to have the primer look, at least use primer that will not let the water through. There are "primers" that are really flat paint for the rat rod look that will help preserve your work.
I think either Mustangs Unlimited or National Parts Depot has the good ,i think it is listed as best bar.It'll be a driver, so I'm not 100% sure what I will do under there yet. I have access to a rotisserie so I feel like I'd be crazy not to flip it over and really clean up the bottom even if it will be a driver. I hope to be ordering the inner fender/shock tower assembly and radiator support soon.
Horse Sence- Where can I go to get a good grade Monte Carlo bar and export brace?