Yes I kow about the rope rear main, I was going to build a new engine engine, and I am running the engine in it now and know I have to have a new cam and the dist gear too so the oil pump will turn the right way , and have not been able to look at the old engine yet but got to have a cam custom ground since you want a cam in the 0- 4000 rpm range I am raising the compression with pistons and going with 340 heads everything else I'll use.