U You can make either work, especially since you are going low boost/ low rpm. There are ways to fool the engine with early ecus. Not that it is easy, but it can be accomplished since your not going crazy with grabbing the max power capability.
Fuel multipliers and coolant enrichment trickery would be fine with what you are describing (as I understand) Have you done this? This is a speed density system, no mass air flow sensor. These were never intended for positive plenum pressure, only a vacuum. I don't know of any way to overcome that.
"Follow me the wise man said, but he walked behind"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost conversion.
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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