Check Amazon, comes with all of the hardware and gaskets, usually under $100 with free shipping.

 

Well I managed to get it done. I ended up going to Ace hardware and getting some studs and sliding it on that way. I got it onto the studs and then took a long punch through the wheel well and tapped on each side to slide it on. Worked pretty well but was certainly a pain in the ***. I replaced the spark plugs while I was down there as well. I knew the rear cylinder on the left side was missing due to the leak. When I pulled out the plug I figured out why. lol. So I installed the new AC delco platinum plugs that the previous owner bought but never got around to installing. I didn't replace the cap, rotor, or wires although they certainly need it from looking at them. Didn't have the money for that this week. So it's still missing, but not as obvious what cylinder(s) now.
Here's some pictures.

 

When I replace exhaust manifold gaskets,I always use a blind stud:a bolt with the head cut off to guide the manifold back into place so gasket failure is minimized;I do the same with water pumps as well! Seems to work every time!

 

As an aside: My 1984 350 "M" motor never had exhaust manifold gaskets installed from the Janesville WI plant on my special order C6P chasais C-2500! GM NEVER took care of this issue either!Amazing!

 

My truck has a 94 4.3 its got an exaust leak from the manifolds also.when I get time hopefully before winter realy gets here I got change them.One thing I have alot more room than changing them in a JImmy.