20# low???? bahhh I ran a 302 for over 2 years w/ 0 psi I ment zero psi @ idle and 5-10 tops on the road, my 400 runs 65-70 ish in the morning and will range from 15 @ idle to 40 cruzing @ 15oo rpm. I was always told 10 psi @ idle and 10 more per 1ooo rpm, yours sounds normal to me
~Nate~
~Nate~