You wont feel the roll off in hp with a roller cam as much as others.I use quite a bit bigger cam and my peak horse power is at 6,500 rpm.(6470 on the dyno)It will easily run past 7,000 rpm maybe losing 60 hp? your cam will do the same.
Go ahead and put arp bolts in your rods and go racing. 118 mph = low 11s or maybe high 10s.Have fun,,,(headers are not too big) I used 1 3/4 headers on my old roller 355.