One heck of a project you are looking at!
Although the sheetmetal is in not that bad of shape for how old it is and being left outside, there are many other obsticles with this tractor. Depends on what you are looking to do with this tractor (parade/show or mowing/garden), to me would greatly depend on weither or not it is a viable project. With it being an 'A' and not a Super A, the hand lift will be a pain in the rear for gardening, especially with no rear lift. I'm assuming it to be a Mag ignition, with no lights or generator, with hand start only, not a bad thing, but may get old depending on your physical condition. The front tires are shot, rear rim that can be seen looks bad as well. If looking for a parade/show tractor, there are not many of the early 'A' tractors left around these parts. Great look of nostalgia with the hand lifts. Engines from A's, B's, BN's, Super A's, and Super C's will work on this tractor. Plenty of Super A's around.
But, with all that said, usless this is one of those deals where the owner says; "I don't care what you do with this thing, I'm tired of looking at it, please get it off my property", I would have to pass on this one. Way too many other machines around these parts.
Hope this helps.