Knocking 340

There was people lining up to buy the engine so I put a 25% deposit down on it. 340's are rare in the UK, pre-73's even more scarce. I'm paying $1250 as is. it still turns over smoothly. Its a gamble but one Im willing to take. If there is nothing much wrong then Ive got a $6000 engine (In the UK at least) for $1250 and if its scrap then Im sure there is bits i can salvage for my '73 340.
What's a running one worth over there? I may want to ship one over for sale!