As others suggested, start with something mild, then go up to something harsher if necessary. There's no point in using toxic chemicals if you don't really have to. The paint will come off the parts easily, but the frame and fork will be hard work I'd say.
The first digit in the four or five digit serial number, on the underside of the bottom bracket shell, will give you the year. A cursory glance reveals an '80s bike, so for instance, if the first number is "6" it will be a 1986.
It should come up alright I think, after much cursing at the silver spray. I'd get rid of the crappy Campy shifters and 980 derailleurs and put on something like Simplex Retrofrictions mated to Suntour Superbe Pro derailleurs. Oh geez, I'm probably starting a parts war here.
Also, put that stem down before it snaps off!