The patient is a 69 Z28 with 302 and solid lifter cam. A few months ago I changed out intakes for an orginal Z28 manifold. I did not check initial timing before the removal. After it was back together with timing set at 6 to 14 the car only had about 5-7 lbs of vacuum which was not enough to operate the power brakes. Before the switch the brakes worked fine. I have reset initial timing with a vaccuum gauge and the highest vaccuum is about 12-14 lbs at timing setting of about 30 to 35. The car seems to run fine with this timing setting. I have disconnected the vac line to the distributor when setting the timing and it uses ported vac. Any ideas on why I have to set it so far advanced???