If it's from a HKS stroker kit, it can be one of these only:
Crank from 2.8L kit Step Zero - 550PS, 8000RPM:
77,7mm Fully counterweighted. Isonite (Salt Bath Nitriding) Treated
Crank from 2.8L kit Step 1 - 600PS, 8.500RPM:
Forged 77,7mm Fully counterweighted. Isonite (Salt Bath Nitriding) Treated
Crank from 2.8L kit Step 2 - 800PS, 9000RPM:
Lightweight Forged 77,7mm Fully counterweighted. Tufftride treated.
Whichever one it is, you will need the correct bearings, conrods and pistons to go with that crank, let me know if you need anything.
Regards,
Chris