check the brajes disengage, they could of seized by now, if need be string the shoes out of the drums then move it.
change the oil/coolant in the engine, clean up earth points, put a fresh battery on, take all the plugs out, drop a little oil down the bores and turn it over by hand if all is ok try the starter, ensure there are no water leaks/serious oil leaks and make sure you get decent oil pressure. if all is well add a new set of plugs and give her a go.