HI!

My 383 sucks, i have never been able to make it run at full trottle,it leans out over 3500rpm and starts to jumps,the pressure dropps from 43 to 22 psi.
I have a walbro 255 and a hotwirekit ,my injectors are 33lbs,i alsoe have a set of 60lbs and ford racing 24lbs,but not tried them on.

The engine was built for E85 and i drove it last summer on that but still samt problem,i thaught it was that it needed more fuel ,so this summer i went back to 99 oktane fuel but still same problem.
My last choise is fuelpump or fuelpressure,could it has been damage by that E85?
I have the holley stealthram fuelpressure regulator.
So tired of this now.
I have run several logging and the man who helps me whith tuning has no direct clue either.
Fuelfilter all new.
Ay ideas ?
Anders