Help with codes?

[withamc]

I just transplanted the engine from my '86 to my '93. I had these same codes in the other car, but the '86 didn't have a check engine light. Now it's annoying, plus it won't pass smog when it's time. When I swapped the engine, I kept the plumbing from the '93 in the car, so the smog pump codes have to do with the engine itself. Also the GT-40P heads are drilled for smog. Any help would be appreciated. Here's the codes:
21, 31, 44, 94
Do any of these interact, as in one of the codes causing other systems to malfunction?

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93 GT, CCM long block, GT40P heads, Crane 2031, 1.7 RR's, Moroso cold air, 73mm Vortech, 65mm TB, Cobra intake, 24# injectors, MSD 6AL, MAC GT40P headers, 2-1/2" BBK H-pipe (w/cats), Flowmasters, 3.55s, B&M Ripper shifter, Black Magic fan