What to look for in U-pull Magnum?

I am also considering ding a similar swap. My hope was to install a runner and then down the road swap the heads out if they were cracked. Just want a runner with all the wiring for a swap. Bought a wiring harness from Four Eyed Fox on FABO to do this. Just have not had the time to go to the yards and get an engine.
Please keep us informed on how it goes for you.

Mike