[351wStang]

Since you have a higher compression ratio you may need to upgrade to a mini-starter. I have a mini-starter on my 351w and even with the blower it started my motor just fine every time. Your idle problem sounds like a possible vacuum leak. The problem is not the stall converter. We need more information to properly diagnose this problem. What is your timing set at? Is it vacuum or mechanical advance? If its vacuum advance how large is your camshaft? Once you get the car in gear and running how does it run out on the road and under load/acceleration? My first guess would be a vacuum leak, but there are a number of possibilities. Try spraying carb cleaner around all vacuum fittings, the base of the carb, around the intake, ect. Loose intake bolts or a manifold vacuum leak can cause similar problems. Tell us all you can about your problem and any related info about your combo that you are willing to share may be of some help as well.