Small block 383, world heads (looking for the papers on them), comp cam (also looking for the papers) 750 edlerbrock, air gap intake manifold, stock Volvo exhaust manifolds all mated to a 290 volvo out drive. What rpm do i want to stay under? I know i need the head and cam info to get an accurate red line number, but since I solved my timing issues, this motor seems to rev to the sky. I'm replacing my tach today so ill be able to get an accurate reading on my rpms. I definitely need to go up in pitch on my prop, that's for sure. I can feel it not biting very well. can I also get a few mph out of the right prop? I have some Volvo aluminum prop on there now. a little beat up.