MY CAR WONT START important is underlined

1974 Caprice 400 with 86 camaro(89 prom) TPI with MSD 6al
i have a 86 tpi setup with the 89 prom and the sonovabitch once again wont start. initially the car was running slightly lean on acceleration but pretty solid then the coil pickup in the dist went bad and left me stranded on a rainy day. fixed that ran solid once again and the alternator went leaving me stranded again. fixed that and somewere along the way the smog pump lines to the exhaust manifold that were plugged on O2 sensor side opened up and the car ran a pretty lean(i think stuck in open loop) for about a week but had no prob starting. started burning my own proms and left the car siting for 5 days and for the first time in my possession the car seen snow now it cranks but wont start and is in limp home mode

TPI 400CI ENGINE NOT 305

THINGS IVE TRIED AND KNOW
-reburning the prom with the ANZA.bin from tunerpro but car wouldnt run so now i have the original burn (89 automatic camaro 305)
-shooting it with starter fluid very little noticable change
-fuel pump turns on with the key in on position for a few seconds
-car barely coughs
-i grounded a few wires on the body im getting spark
-the limp home mode on my memcal was made for the 305 so it wont run my 400 its run before in limp home mode but just had trouble idling and ran real rough
-brand NEW fuel filter, air filter, wires, plugs, cap, rotor, and ignition coil just for tune up
-parts replaced for PROBLEMATIC reasons are fuel pump, tps, ignition module, magnetic pickup coil, and ECM
-NO trouble codes just 12
-exhaust manifold holes have been plugged
-bench tested and cleaned injectors a month ago
-datamaster would not connect to the ecm thru the aldl for **** but ive never used datamaster or datalogged b4 so i may be doing something wrong
-if i pull the prom or the neg bat terminal and reconnect wen i turn the key in the on position it will flash once then stay on indicating it running from the prom, then after i crank it and until i pull the battery terminal again it wont flash and just stay on indicating its in limp home mode
-code 12 is all im getting
-VATS has been turned off
-good compression above 150 on all cylinders
-when pulling plugs for compression test i noticed they were soaked in fuel
-injectors resistance 15.5-15.8(perfect)
-injectors tested with test light and they flashed very quickly with key in start position i guessing that means there good.

ive read somewhere that two terminals need to be switched on a 89 aldl from a 86 harness. i dont even really know if its a 86 underdash harness so its a mystery underdash harness, that may be my datalogging problem.

i feel if i can get it out of limp home mode the car will start but i dont know why the car is in limp home mode or why a tpi motor would be in limp home mode. tpi trouble shooting flowchart didnt offer any help. im thinking my timing chain slipped a gear but i dont know how to test that

 

Im stumped can anyone offer some help?