Hello all. I need some advice on which carb to use with an 83 D-150. It was originally a 1bbl on an alum. intake, and I wanted to do the "super six" conversion. I found a complete carb, intake + exhaust, breather, kickdown linkage (which i do not need 'cause I have a manual tranny) all the bolts, etc. etc. at Mopar Nationals in Columbus for a good price. I cleaned everything up, rebuilt the carb, put it together and could barely get the thing to run. Finally broke down and had a mechanic (who is well known in this area for rebuilding carbs) rebuild it and it ran good for about a day. Long story short the carb has been rebuilt 4 times and after every rebuild it will run good for about a day, then it will get to where it won't idle. Checked around the engine and the only spot I can find any vacuum leaking is around the throttle bushing and egr valve, both of which isn't too terrible. Is there any other carbs that are good to use? I have the number from the carb, is there any way I can find out if it is an actual six cyl carb? Is there a good place to get a new carb? It doesn't run too horrible with the one bbl but I tend to get aggrevated when I can't get the truck to go over 50 in 3rd gear heading into the wind
About the only other thing I have done to the truck is put 2" exhaust from the manifold back, which brings me to another issue: is there any GOOD way to get the pipe to seal to the manifold without blowing the gasket after a week? Any help would be GREATLY appreciated, and I would also like some websites or recommendations on where to find slant six parts. Thanks!!! 
) Thank you for your advice, it is greatly appreciated!