1 more thing to think about when towing a trailer srw and a rear tire failure not so good, with a drw no problem you keep on trucking till you can pull of the interstate.

70 duster full chassis super pro 416 CNC Indybrock heads 727 w/brake

best so far 1.212 60 6.219 in 1/8 at 110.88 9.768 at 137.81 1/4