Depending on how far you want to go. I'd hit up a rebuilt L32 instead of the L67 for the better rods etc. Likely the costs are nearly the same.

Then if you get a long block, typically they come fully assembled without oil pan, without valve covers, without lower intake manifold and everything above that, without accessories etc.

You'll end up needing a charger, harmonic balancer, throttle body, LIM, oil pan, you can use the accessory brackets, sensors, wiring off your motor, I'd suggest sticking with your transmission. Therefore you use the flex off your current motor. Change your diff to HD and passenger axle which would keep you in a 3.29 gear ratio, but with HD diff.

That's most of what you'd need to make it happen. Then soem misc stuff like vacuum like etc.