like i said, Largeport (bluetop)turbo/or GZE turbo first or if you want strong NA power and have some cash go Highcomp 16v (redtop from an AE92). There is a reason all the high powered Japanese guys/Formula Atlantic guys most all go with the 16v head/AE92 bottom end (piston oil squirters)...and its because its proven time and again to make insane power when the right parts are thrown at it and you can get some decent rev's into.