Mustang Dead Please help

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My Mustang Died last night. I'm tring to think what might have happened I don't know please give me ideas.
Its an 89 mass air with edlebrock performer intake, steeda #19 cam, 65 mm TB, 1.72 Roller rockers full mac exhaust,.
Now I don't think that this was too much for the stock fuel system. but here is what happened

I was runnin though the gears up to 6k and I let off the gas to shift to 4th and got on and it hessitated like it was off( like no gas or no spark) I had it do this before and when it would I would let off the gas and the power would return this time the power left and I did not let off the gas entirely. The car never went back on would not even try starting. just turned over till the battery went dead. I am afraid I cracked a piston from not enough fuel is this likely with a forged pistons. Does anyone know what causes this no power situation when getting back on the gas between shifts. Please give me a clue I don't know what to do. was running strong then bam its dead