First, welcome to OCC.
If it had adequate oil in it, prolly the rotating bottom end is ok,
but your suspicion of the cylinders siezed due to overheating is a good a guess.
@ this point you have nothing to loose to give it a try running.
Obviously it has ring damage and possibly cylinder and piston scoring, but it is a crap shoot.
One might get real lucky on the scoring issue.
So you have some choices:
shoot some oil in both cylinders and crank it over a few times.
(a couple of pumps with a squirt oil can)
Then try to run it keeping the rpm's low till you see if there are any obvious strange noises, if not, run it a while.
Then change oil while hot, letting it drain well.
If all seems good then put it to work watching the oil consumption and smoking on starting.
It got hurt seizing, no doubt,
and the proper thing to do is rebuild the cyl assy's minimum.
That said it might run a long time as it is, or it may turn out to be hurt enough it needs attention now before using.
You make no mention what your long term goals are, so your call.
Luck!
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