Aaahhh, music to my ears.... 1227749 GM ECM on EVERYTHING!

Actually, you don't need to find a turbo sunbird... any of these cars have the '749 ECM:

1987-90 2.0 OHC L4 PFI turbo “M” LT3
1987-88 2.3 DOHC L4 PFI “D” LD2
1991-93 truck 4.3 V6 PFI turbo “Z” LB4

BTW, if you don't need to run peak and hold injectors, but rather regular "boring" injectors, you can use the syty code (mask $58) in the 1227730 ECM, which is by far more common:

1987 2.0 L4 TBI “1” LL8
1988 2.0 L4 TBI “1” LL8 (early)
1987-89 2.8 V6 PFI “W” LB6 (exc. “W” body)
1988-94 3.1 V6 PFI “T” LH0 (exc. “W” body)
1990-92 5.0 V8 TPI “F” LB9
1990-92 5.7 V8 TPI “8” L98 (“F” body)

There are differences between them as far as driver chips, and number of mosfets, but without using peak and hold injectors, you can use either ECM with the $58 syclone/typhoon code (set for I4, V6, V8 depending on your engine choice).