If the recon engine comes with a warranty, then that is all the 'proof' you're ever going to get that the engine is good.
I'd suggest you accept the offer, and tell them to get on with it. Talk to them, agree a timescale by which you will have your car back. Agree as to what happens if the car is not ready by that time.
Technically, you could reject the car under the Consumer Rights Act. But you've left it a while, and if they fight it then it could end up in court and costing you money.
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