Thanks to both Dave W. and fastacton. Dave, thanks for the referral to mrinjector. Will request that he test at 20 and 30 psi after reconditioning the injectors. With his Lb/Hr numbers at these psi's can get and idea of how they are working. Then can interpolate what would be a test fuel pressure to set the adjustable regulator at. The higher pressure injectors provide better atomization of the air/fuel mixture. Yes, replacement injectors are expensive! Again, thanks.

Fastacton, I have a Trans Dapt TBI to 4150 carb adapter. It had to have the 2 bores enlarged to maximize air/fuel from the throttle body. The same will have to be done to the aluminum 4150 Intake Manifold. Will watch carefully, the mating of the throttle body to adapter and adapter to 4150 manifold to make certain there are no vacuum leaks. Again, thanks.