Problem solved!!! Turns out the ignition wiring in the old 68 mustang was reduced to 8 volts to save the points. I was only getting 8 volts to the run side of start solenoid, and coil. I added a switch on the dash to put 12 volts directly to the solenoid. I am going to call painless performance and see if they will make note of this for people doing the swap into older model vehicles using point style ignition.
Thanks for all of your replies!!
Thanks for all of your replies!!