ADDING A 4BBL..HELP Please !!!

Putting a 4bbl on it is a surefire way to get less driveability, less enjoyment, and more hassle. For what you would be gaining it is a lot of work. As far as the pedal is concerned I have considered swapping to the pedal setup out of a 1964-1966 c-body. They used a cable style floor mounted gas pedal. It is wider and taller than A-body stuff, but should fit in there and look like it belongs there. If you get the c-body pedal make sure to get the bracket that goes with it. I may have lost the bracket for my set and probably never will install it anyways.