65 Barracuda daily driver

Transmission looks nice. I don't envy you having to fool with the shift/park cables though! Before you get the V8 in and running, you should get one of those laser red dot thermometer guns. Make a list of stuff to check as soon as it starts. Coil, bulkhead connections, ballast resistor, ignition switch, etc. If/when it quits you could quickly check all of those temps again to see what got hot. It has about got to be electrical. That's about all it could be unless the fuel pump is giving up or the sock on the fuel pickup in the tank stops up after a few minutes. Keep plugging along, and you WILL win! :D