360 core builder in or near Colorado springs, Co

You should get out of the past. Find you a decent Magnum core while there are still some to be had. Don't you have an LKQ around there? They should have some 5.9 Magnums. With a warranty, so you know you'll get a good core.
They have Pick-n-Pull yards there in Denver. I've been to one with my son and got a seat out of a Ford truck for his Power Wagon. It cost me 45 bucks. He struggled and struggled to get the back bolts out until I finally had to go in and get it out because we had my grandson who couldn't go inside. I slide the seat forward LOL easy cheesy. He was trying to reach underneath the seat lol