Got off the phone with Ghassan, I decided they will do the build. They have so much experience with BMW motors, their heads come from headgames, and they are only a 7 hour drive from me, so I can save on shipping just driving the core out and the new motor back once it's ready. It also comes with a 2 year unlimited mile part and labor warranty rated at 800hp.
Hard to beat all that.
So to mate with my GTX3582R gen II speedtech kit (already on my motor, but I've lost compression in cylinders 2,3, and 6), I'll now have a new built motor from Ghassan that will have a headgames CNC ported head, ferrea oversized valves, spring retainers, and valve seats, schrick high lift cams, a pinned crank so the crank timing sprocket can't come loose, carrillo rods and pistons, ARP head studs, and a closed deck insert.