1994 N14 350 HP to 500ish HP, what's needed?

Drive it by the EGT gauge, preferably in the manifold. Keep TIT 1250° or less on a hard pull.

 

What was the CPL? And was a Celect or a Celect Plus?
I'd love to know because mine is 1994 CPL 1574, CELECT, ESN 11704261...It has 3 erroneous codes; low coolant level, low but adequate oil level, and one for intake manifold pressure (I think).
All sensors are new, cleared all codes and they just come back. Wiring harness from battery fox forward is all brand new, new pass thru connectors, new in head connectors are new. All that and we can't get cylinder 6 to fire!? We have also replaced injectors with reman 3652542RX, but wish now I had gone with BIGGER and better hard parts....or swapped it out entirely with something less tedious.

 

I sold it 10 years ago.