I think I'll just TBI the 250 for the 4wd truck.
When the next round of Marshall's become available I'll get one for the turbo 292 build (making a drag-ish truck). Maybe if I ask nice I can get it pre-drilled. So far I'm unimpressed with my local machine shop, and my home shop is great for non-precision work (pretty sure its' the old machine and the older operator combined).