Thankyou! I too have the VIC340 intake with the Indy RHS-X heads.(closed chamber) so compression will be up there. So 4degrees advanced, nice, Thankyou. So with that, what’s your total timing set at? I haven’t decided if I wanted 4.10 or 4.30 gears yet, have both pigs ready to go! 70 Duster 340/727 car.