Pontiac parts are real easy to find, but don't speed any money on the 350. Parts for the 400 and 455 will be about the same price if not cheaper, supply and demand. You will horsepower dollars ahead by building a bigger cubic inch engine. If the 350 is ready to run, by all means do it, it can only help the F**d! If you are really interested in the Pontiac, check out the book my dad wrote, High Performance
Joe