Just wanted to introduce myself I'm working on a 31 5 window coupe and a 53 mainline coupe,both 350 chevy powered.trying to get info on channelling the 31.Any advice is welcome .Just wnamt to go 3 inches to cover 2X3 frame but i want to raise the floor so iit is flat.top stays as is for the look i like and of course head room. cacarmi