Jim;
As has been mentioned my T-5 is the ticket. With the T-5 and a 3.55/1 differential my long block Desoto engine runs my P-15 down the road at 70 MPH turning 2200 RPM's.The speed is measured with a GPS and the RPM's with a tachometer. I have ran at 70-75 MPH for hours on end with no engine problems.
Have you decited what way to go with repairs? Hope you stick with the flathead but I will understand if you do not.
