Yeah I just used magnum truck manifolds. Lots of guys from all brands making good power on manifolds. How much power are you trying to make? My iron headed 360 made 470hp to the tire,13psi, Hydraulic roller, non intercooled, with the converter slipping 18%...

Getting the converter fixed and then we'll turn up the boost. Going to make 600hp at the tire, but it might take some water/meth to do it.