timing
need help with this engine put new engine in my 67 camaro 350 patriot vortec heads complete roller motor holley double pump full mechanical 650 carb when you set the timing up around 6 degrees and set the idle it runs when you and the vacuam it ands 23 advance when i take the car for a drive and let it go buy the time i get home its idle is way to high i have to turn it down and when you go to check the timing it has moved to about 60 with vacuam and around 25-30 without i have had this to 3 garages they say the timing can't move its your carb its your transmission taking the vacuam you don't have a stall converter is why your engine stalls in drive not park.can engine timing move after it is set bolt tightened take it for a ride and its totally different from what you set. car in garage four 6 weeks now can't get a answer from mechanics???