Even OE engines often require some "fiddling" to make them run well at idle in closed loop. Cam specs can play a big part in this. If you're going to go open loop, and you don't have a cat, you can go open loop "everywhere."

I didn't say turn the fuel pressure up to 20 psi. I said using the 454 injector and adjusting pressure to 20 psi gives about 43 lbs per hour of fuel delivery. If you increase pressure in your current injector to 20 psi you'll increase flow by 24%.

Watching VE is only one step to ensuring the injectors will work. You need to look at the minimum IPW value in the calibration then watch to see if the commanded IPW on the ALDL is matching that value. If so then there's a good chance the injector is too big.

Mark, his injector constant would have to be reduced by almost 60%. That's a big adjustment.