I built a 56 235 full pressure motor for my 46 1/2 ton that puts out over 300 hp on the dyno, I found an old guy at a machine shop here in pa. that used to drag race these motors in the 60's and he put my motor together with all the right parts, and it wasnt cheap, im talking close to $4,000....(1700 for just the clifford/weber 38 intake setup)

http://i629.photobucket.com/albums/uu14/kurtdh519/002-1.jpg