This is my first post, so please be gentle!
After a lot of thought, (and with plenty of encouragement from the wife

I had drawn up my wish list, and thought I had settled on my final spec for the car. But the restorer has thrown me with an unexpected offer!
I had originally wondered about a 1275 engine and 5 speed 'box, but decided it was too expensive to warrant the expected benefits. But now the restorer has offered me the chance to have the engine, gearbox and prop from one of his own personal cars that is currently for sale. It would be a 1275 engine and 5 speed Toyota gearbox. He says they are both in very good condition and have done only low miles since being rebuilt. I haven't yet been to see his car or test drive it - I will be going in a couple of days to try it out.
In my agreed fixed price rebuild, I have a reconditioned 1098 engine and reconditioned gearbox included. If I give these up and for an extra £2k, I can have the 1275 engine and Toyota 'box with all the work done and fitted into my rebuilt car.
Bear in mind I had already decided that it was a good idea to have that setup, just too expensive. I'm not really asking for opinions on if it's a good idea in principle, just on value for money.
So my question is, does this sound like a reasonable offer?
I don't have any more info on the actual engine, or it's state of tune, at least until I go and see / test drive his car. Are there any questions you can suggest that I should ask when I go.
Sorry about a rambling first post, but this has thrown me a bit!
Any ideas/opinions will be gratefully received.
Steve