Bob Mckray, Gene Adams and a few others have gotten 370 on the intake out of the 555 heads. If I could do my 392 again it would be a stroked 354, Stiffer block,smaller package. Big Al's toybox has a run of Moroso pans in stock. Stud everything and plan on buying adapters for everything. My timid hydraulic 392 pushes my 4300 58 Ply wgn to mid 13's through manifolds and a 518. Good luck Joel and great X BTW.