Exhaust options/help?

[Sooner1970_K10]

Ok, I have an exhaust leak coming from the passanger side (bottom of the manifold area). I took it apart, the pipe and heater riser/spacer thing-a-magig. However I cant get to the top of the pipe to clean it up. The previous owner welded the exhaust system together so I can dismantle it to clean up that end. I assume it needs a new donut gasket and flange gasket and it would be good to go? However since I can get to the top of it to clean the pipe I dont see this being easily accomplished. I dont see any holes in the pipe or muffler. What should I do?

I looked on summit racing and found this pre fabricated system. I am not even sure this part number will fit a 4x4 since its listed only for a C10?
HOK-16621HKR $ 159.88

Local muffler shop says they can do from the manifold back for between $ 180.00 - 220.00. Thats with the aluminized 16 gauge steel 2 1/4" pipe.

If I do get a new system what muffler should I go with? This isnt a show truck or even a nice truck so I dont really want to be spending 100 bucks a piece of mufflers.

Or should I try to remove the weld and break the pipes apart, clean the top of the pipe and put the new gaskets on it and let it be for awhile?

Its a 1970 Chevy K10