only comment i have is my installer mentioned that the twisted wedge heads had some kind of oiling problem that has yet to be fixed. that's why i got the livernois heads instead.
cam suggestion as in stage or brand? personally i wouldn't go higher than stage 2, but it's also my daily driver. if it's primarily a race car, 3 would be fine. brand i would go comp cams, just never heard any problems with them.
keep the pullies. take em off if you add a blower.
as far as power, i know the stage 2 heads and cams will give you about 85hp with a blower, not sure if it's the same na. also not real sure about the bore and long tubes. but i would guess you'd be getting close to 400hp, maybe hi 300's. and then the nos on top of that. if you do go nos, may as well get direct port injection kit.