Wondering if any of you are running a combo similar to mine and we could compare vacuum readings. I don't have enough vacuum to utilize the vac advance in my distributor. I am trying to determine if I have a leak, or the cam is too big. Here is what I have: 400 block bored .030, 440 Source 451 stroker kit. 10:1 compression, Racer Brown SSH-44 cam (242/242 duration @ 50, 108 lobe separation) Stealth heads, Harland Sharpe 1.6 intake-1.5 exhaust rockers, Edelbrock Performer RPM intake. I am getting 7" of vac at 900 rpm idle. The car starts fine with no kickback at 16* initial, but needs more timing once it is started. At 28* it seems to run good, but the problem is that 7" won't pull in the can to get there. Did a leak down test. No hissing in the carb or exhaust, only the dipstick tube. I did the test when the engine was cold. My 1st gauge is at 95 lbs. 2nd gauge on each cylinder reads in firing order: 84,92,82,86,90,90,82,81. Had the plugs read and was told that 4,3,7,2 are showing lean, and #1 has excessive fuel deposits.