I guess if seized from sitting My question would be for how long. I've had a lot on sucess on engines 8/10 yrs or less after that it's a pig in poke. An engine tear down might be required. My question would be why was it parked and was there trouble with the SOS trans.
I don't know you capibilities so it's your call.
If you do go for it make sure you disengage the trans before moving it.