motor dies after it gets to temp

I have a 72 duster408 stroker. I have a msd6al box, new msd blaster 2 coil, I will be replacing the electronic distributor with a new one I have. So sympton when the motor gets to 192 the engine dies. 1st I thought it was vapor locking because of temp but I changed the fuel system from carb to fuel injection. The entire fuel system changed. It still fails with carb or fuel injection. The fuel injection does have a hand held unit so I watch and at 192 I loose spark not sure why. I hope I made it clear as I can.