What should I do with my 340 that has been sitting for years.

coair73x said
I totally agree. I am leaning towards disassembling it and cleaning off the rust and getting it oiled down and into a thick plastic bag. I would like to see if I can turn it but with all the rust not sure that is a good idea.

Probably not. I would try and disassemble as is and derust it and do as you say.