Extended cranking then dies 95 powerstroke
 

Just bought a 1995 powerstroke , has running issues. It's got a fuel bowl delete kit, and has been converted to an electric fuel pump instead of the mechanical pump. I can get it to start after cranking for around 15 seconds, then it will run kinda rough, and eventually stall, I have a fuel lab regulator for fuel pressure, with the key in the On position it will climb to 60 psi of fuel pressure as soon as the engine starts and runs, it smoothly drops to 0 but continues to run until it stalls. It already has had a lot replaced by the previous owner. I have pulled the valve covers and can see 5 of the injectors are yellow and say alliant power , then I have 1 brownish injector, and the other 2 injectors are black and appear to be original. Looking for any advise thanks.