Personal preference, I will take a post car 99% of the time over a hardtop as I think of a post/coupe as the true traditional hot rod. Throw in a bench seat 4spd and that's what I like. If it is a real RR (RM21 car) it is rarer than hardtop also. Your car to do with as you want but I think it's crazy to mod into hardtop. Trying to sell hardtop with post vin will turn out interesting and any financial gain I would think. Sold my post car SB still kick myself.