thanks for all the help, advise was really very helpful, after much consideration i have decided to use the draw through setup but wit an lpg throttle body, and setup and tune the motor to run gas only, many advantages like the fact that its already gas, its cold, its cheap and it runs really well upto about 10psi according to the experts at gas research, and as a bonus its cheap and they seem to think 120hp from a resonable stock motor is quite achievable.