You certainly don't need a shop's help to do this swap. There is tons of information out there if you look.
Big Block Fox
460ford.com :: Index
Just to name a few. Weight is about 200# more than a small block if you use iron BB heads. Go with aluminum and knock off around 75-90 lbs. You can use either Hooker, Crites Restoration, or Ford Racing engine mounts. Headers from just about any header manufacturer. C6 transmission will fit with slight modifications to the crossmember (be sure you use a double hump transmission crossmember). An 8.8 rear will live for a while with proper preparations. Depending on how serious of a big block you go with you might want to look into a bolt in 9" rear housing from Currie, Moser, Strange Engineering, or Mark Williams.
An aftermarket tubular crossmember will free up tons of header space and make this swap considerably easier. We've done several of these swaps and the cars consistently fly. Our first Thunderbird had a 466" engine with iron heads (unported), a flat tappet hydraulic cam from FRPP, Offy Port-O-Sonic intake, 850 Holley, Hooker 2" headers, C4 transmission with a 3500 converter, 4.11 gears with 28x10.5 tires. Weight came in at 3320 lbs. and the car went 10.50's to 10.70's at 133 mph. No problem.