I just caught up on this. I'm thinking you should just stick to a thorough fuel system cleaning before you go any farther. Carbs, hidden filter and petcocks. Take your time an do one thing at a time, it's all easy enough especially if you use your cell phone or digital camera before you disassemble the parts so you can insure the reassembly is correct. Then just go ahead a replace all the vacuum caps. Try that easy stuff first, remember Occam's Razor.
