Is a 7.25 rear strong enough?

You will be fine!!!!! i run one using 255 60 15 tire with a 7 inch rim dumping my clutch all day with a 4 speed, the most H.p you'll get at the fly wheel if luckly is 230/210 and at the wheel your looking at 190/180 H.p, unless your running a super charger or turbo etc

i got a 7.25 with 3.55 gears in it peg leg if your looking for one. Nothing wrong with it just over racing my slant i just drive the damn thing now.