160 cranking psi; advance the cam or run it?

.040 over 360 block with a 4" arm, 9:1 compression, MP .557 cam, 596 heads, Eddy air-gap intake, in a 3550 lb duster with 3.91s and a 3500 converter. had the cam in at 108 and it had 145 psi cranking. i advanced it to 104 and it now has 160. mind you i take my readings with the motor cold, all plugs in, and carb at rest. do ya'll think i should advance it 2 more degrees or run it as is?