pressure should be set to ~38 for 1g, ~43 for 2g. The easiest solution is bolt on regs like the one at
www.buschurracing.com (375) and
www.fullthrottlespeed.com (150?). Many people including myself just get an Aeromotive unit (125) and all the necessary AN plumbing stuff. For all the parts to assemble your own setup see
www.anplumbing.com,
www.summitracing.com, and
www.autoalchemy.com.