That wouldnt suprise me either, I just picked this car up two days ago and im finding all kinds of slop. Just **** poor maint. from the previous owners.

 

10# for every 1000 rpm is correct..real low idle at 5 psi would not surprise me and I definatly wouldnt be looking to rebuild it..my dart block 408 with a hi volume goes low at hot idle..And more cubes in a sbc means more power.