Diesel engine will not rev.

I have put a low mileage 2016 lump in my 2010 Legacy ,had to change and mod a few things

1 fuel rail mod as new lump had a sensor on end for pressure reading .so now has old style monitoring.

2 injector loom plugs

3 had to fit original turbo as particulate filter wouldn't match new turbo.

never ran really well ,but was useable ..until cold weather set in ..none of the glow plugs were working.

Engine out again as glow plugs snapped off in the heads...so heads off and punched the plug tips back through .

Motor back in ,starts easily but will not rev past 2,000 and if it does get past it will falter as if starved of fuel ,missfire and smoke heavily.

The injectors were sent to a specialist , checked and given the all clear.

Fuel pressure monitor readings are all ok .

Any ideas..? what have I done wrong, what am I missing?

code reader says 1469 which is a DPF fault ...this did give the occasional dash light before ,but would clear with a run.