355 tpi 91 z28 motor, xr264hr-10 comp cam-.487-.495lift dur 264-270 , dur at .050 212-218, 1.52 roller tip rockers comp cams, 24lbs, afpr,prom by jimsperformance, bbk 52mm, vary ported slp runners, looking for hiflow base, what kind of performance will i get from some l-98 aluminum heads over my stock cast iron heads? what should my compression be with the alum l-98s? also how well will this combo handle a nx nitrous kit no more then 150hp shot if that...dont want to hurt any thing!