Is my engine low on vacuum????????????? Help?????

My 340 combo is close to yours except I run the XS274S solid version and J heads. Cam installed at 105 ICL. I run 30*/35*/48* ported vac. Idle in nuetral 1000 rpm 12", in gear 850 9", tight converter. Lots of folks will say that it's to much timing but I tested enough and that's what the motor wants. Get a magnifying glass and read plugs as you put timing in it.