Where to get a ready to run forged 3.31 stroke crankshaft?

i'll echo the sentiment of scooping up a 273/318 piece. surely you could source one and have it prepped to your specification for less than 1K-ish?

granted if it's the early crank you'll need to handle the machine work for the torque converter register or pilot bushing, but i don't see that as anything that's insurmountable.