Photos of what remains of the engine would be good, with a clear photo of the engine number. Has it got the standard huge hole/ damage to the bottom case due to chain damage?. Is it seized? If, and only if, it is a Sandcast engine as your numbers suggest, it may be worth a bit but condition of the cases is everything. Not worth much if the internals aren't standard. They cost an absolute fortune to overhaul and rebuild and engine parts are very, very difficult to come by for the early SOHC/4's. But without all the info and 100% evidence it's an early engine, it's not worth much at all really.