shanghaismith said:I bought the carb for my 403 from Sean Murphy (he was the head man at Jet at one time). I gave him all my engine, trans, and rear end specs and he built an 800 cfm for my car. I bolted it on and it worked much better than the Summit reman Q-Jet I had been using. If you go for a carb built for your car it may take awhile, I got mine about 4 weeks after I placed my order but it was worth the wait.
http://www.smicarburetor.com/products/sfID1/28/sfID2/9
Had my carb rebuilt by SMI too, he does an excellent job.