If it lasted 50-60 years and it is still good enough today, you would not be improving things by putting in new stuff with a planned failure/obsolescence built into the manufacture in 5 years.

Getting a reputable roofer out was a nightmare, but worth it in the long run. 

Only deal with reputable, experienced wholesalers.

Some lenders may verify, with no income verification, but with a higher interest rate, but this is something I need to do more research on and very much welcome any suggestions on any reputable companies I could work with.On that note, I am roughly familiar with a federally insured Title 1 loan that would even be applicable to properties one does not own!

Comp 1) 3 bed 1 bath manufactured house without the title retired (so you can't get financing).

But a reputable GC would be greatly appreciated for a newer investor like myself.

I know in our area here.. most realtors simply are not going to work with contracts that don't have POF's  they have trained their sellers that its a waste of time to work with any contract that does not have POF>and not just mail order internet POFs must be from local reputable lender that they can verify..

You should run one yourself from a reputable company.  

I was told that GC's typically don't like to come out and give bids on properties that are not even under contract.I'd hate to have a potentially reputable GC come out to walk the property with me and then I don't get the deal and they feel that I wasted their time and that I was just a tire kicker. 

You could partner with reputable investors in your area, or use some of the crowd sourcing investment websites that are out there.