So I built a forged gen 1 sbc 383 w/ gen 3 ecu.
Its a fully built motor scat forged crank wiseco pistons, dart aluminum heads , Accel Pro Ram intake w/ 4 barrel throttle body , 280xfi cam , gt45 turbo , ls7 card style maf , SD 80lbs injectors and efi connections 24x reluctor.
The donor ecm came from a lq4 6.0 van.
Aside from turning vats off should the ecm at least start the engine? I would think so , run very ruff but run no.