426 Wedge possible install challenges

Located a fresh built 360 short block that was removed from a 78 cordoba. Stock crank and connecting rods with 9:1 pistons, new comp cam flat tappet and lifters, cloyes timing chain, Melling oil pump $850 CAD. Ready for any other goodies. Dart already has 8 3/4 rear end, I kept the mini starter off the 273 that was originally in there. Cooling is already there for the small block setup and I'm pretty sure the 360 will bolt directly to the tranny that was attached to the 273 after I do a rebuild. I was already thinking of frame rail connectors and replacing front suspension parts with Hotchkiss kit.

I think this engine may be a good purchase to add to it. the 426 sounds like more work than value for what I want to do. Thoughts?
FYI the guy wants 10k but is negotiable for the complete 426 wedge and tranny that started the conversation. As I mentioned, already built to 500+ HP documented so it might be a cool way to go as well. As Tommy said above...already doing resto so perhaps could still be in the cards. I think thats a decent price for the wedge...again....thoughts?