"The Grocer" is on Arran so you might want to contact him, he's not posted for a wee while - so perhaps a nice PM. He may of course be exceedingly busy so unable to help. Bear in mind its probably 30 miles from one end of the island to the other, so he may not even be that local.
Okay, much obliged guys. I have contacted the seller to ask a couple of questions and find out where and when the engine could be viewed. If it looks like a possibility then I'll PM 'The Grocer' to see if he can assist. Cheers!