I am told that one of the latest (and most unloved?) applications used the best cylinder head- that being the Eagle Premier. If they are compatible with the late heads and your packaging, use twminduction.com triple weber/efi throttle body manifolds. Look around for import performance guys who custom grind OHC cams look for short duration, but tight (numercally low)lobe separation . Raise the compression. The engine has good and bad features, but is lighter than it looks- actually about 10-15lbs less than a naturally aspirated b21/23/230 and less than a b23/230ft.