It doesn't look to shabby. Like other people have said, your best bet would be to go and inspect it yourself. Question him on the specifics of the bore out/rebuild, like was the crank hardened after being stroked? Has he done engine rebuilds before? Was the 'new' cam a brand new one or a "good nick" used one? Which side (top or bottom) of the inlet port did he widen? Make sure he knows his stuff, otherwise you might be best buying a mini built by a monkey.
I got full on ripped off recently (hence rebuild - check signature). The beautifully modified mini I thought I bought turned out to be a real nightmare. The stroked crank was not hardened and cracked, I shreded the flywheel and primary gear and wrecked the clutch (not by my own crazy driving, I might add
), all the mains were loose, the inlet ports were widened on the wrong side (so it did nothing), it still had a normal crap-o-rama head gasket, lock tabs weren't put on particular nuts, the cam's lobes were so worn it's not funny (the worst Cono at MiniCraft here in WA had ever seen)..... And I could go on.
Sorry for rabbitting on, but after my own personal experience, I just have to warn people about buying 'modified minis'. Who knows? It might be a real gem built by a pro. But it might not be. Do the homework I wish I did more of.
PS: I would like to thank the people at RoadCraft here in WA for the outstanding engine rebuild they did...
LOL! I shall be scraping ther logo off the side of my windows once I get the car back.