Well me spokes to my bro and what he had done was left the bottom pretty standard other than higher compression pistons. But the head was worked over with stainless steel valves and rockers (standard stuff with conversion of leaded to unleaded). It is topped off with a Holley 600 double pumper. The head work done by Kev compares to a Yellaterra stage 1/2 manifold kit (It would be cheaper if you want to rebuild yours Tyren to go with a Yellaterra kit). Overall it cost him $2800 in parts and labour and good for about 300 ponies Some original photos have not been recovered yet.