I know of one running in a 1400# Front engine nostalgia dragster running 7.40's at 180+ on injected alky. The dad is a member on here although I don't think he gets on here too much anymore. Basically ran it the way it ran in a round tracker except for changing over to aluminum rods, and slightly different cam profile, buzzing it to 10,000+ fairly regularly. Not really ideal for index racing but drew a lot of attention and other than occasional spring problems was trouble free. Torque, or lack of it would seem to me the biggest problem in a heavier bodied car without a multi-gear tranny (i.e. more than 2-speed). Fair amount of fab work for oil system, bell housings, starters(etc.) but certainly doable for most builders. The P-7 was definitely designed to be a race engine, suprised you don't see more of them in Comp.