Probullit351s

Ok so no help with the last post. This should be more specific to what im asking. The car will not start unless I go at it for 10-15 minutes. When It finally starts... it kind of stalls. I try and try and starts but soon afterwords it stalls. And then the process starts all over again. I checked the grounds and they are all fine nd tight. I also checked the spark and it sparks only when i turn it onto the on position... but when turning over there is no spark. I changed the coil and still the same thing. I have no clue wuts going on. Someone please help me cuz this **** is annoying and there is only 275 baby drivin miles on this stang. It does have a msd 6al ignition box with distributor.... blaster coil...

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BraMas

SO when you put your new engine in you drove it for 275 miles and than it stopped starting right? Did it run good for the 275 or did it seem to have a problem than to?
Are you moving the Dist. to different positions while your trying to start it. I think you said your cuz moved it or something. It could have been loose from when you first put it in and it finally moved the timing way off that could be why it stopped starting. I'm just guessing here. Check the firing order