Cleveland won't start
 

My 1970 351C in a MACH1 used to run and start perfectly but now won't restart after its warmed up-it goes dead and doesn't even sputter. It has spark, is timed correctly (10 BFT), has good fuel pressure, choke works properly and I can't find any vacuum leaks. It has a new coil and original Ford distributor.
I replaced the 4 barrel Holley with a Edelbrock Performer but nothing changed -it starts runs warms up and won't restart. This means its an ignition problem but how can it be an ignition probem if I have spark and the timing is correct?
I need help with this one. Any sugestions?

Re: Cleveland won't start
 

You could have a cracked coil (even though it is new) that works fine when cold, but expands with heat and shorts out. You say you have a new coil, was it replaced before the problem occurred or after?

Is there spark after it's warmed up? If you have spark fuel and air, it should at least sputter or cough when turned over.

Once it has gone dead, have you tried using starting fluid to eliminate any possibilty of fuel problems?