The motor is a Mild 350 with RV cam 10:1 TBI and 2535206 injectors would it run to rich if I put a 454 Pressure regulator on it?

 

Might just be better to run your stock regulator and get an adjustable fuel pressure regulator and make sure your fuel pump can handle the increase.

I got my APFR from CFM-Tech and the appropriate spring from topdownsolutions.com. My fuel pump I got from tbichips.com. He's on eBay as well. All of these guys are excellent to work with. Honest business men.

 

I believe there are differing 7.4L regulators. the one that was in my 7.4L TBI ran the pressure at 26-32 lbs so I will assume the spring was 20-40 or so. Get the top down solututions spring as suggested or use stock spring at 12 lbs. I am confident you are aware of the need to tune the ECU. The 2506 I thought were 80 lbs injectors(i use). Now I was told they are 90 lbs by another confident member? Still not sure which they are. Do you have any documention as to what they are?