421 Cub drag ported, 20cc domes with 170 psi and squish at .055, Shearer sb in-frame, 39 pwk's on alky. I would like to pick up some more low to mid but don't want to run the risk of burning a strap or a hole in the piston. I dune the bike hard and then drag at banshee hill. Currently my timing is at +5, can I add more timing if I keep the power jets fat?