My 1940 ford coupe has a 350 vortec engine that would stall once in a while. I replaced the carburetor with a edelbrock 1406 and replaces a bad coil that works with a mallory unilite distributor. I thought I had fixed the problem. The last time I took it out I had driven about 10 miles and was about a mile from home. Then when pulling up to a red light the engine just died. After cranking on it the engine fired up and I got it home. It's not dirty fuel filter and wasn't low on gas. What am I missing?