Not sure this is the right place to post this...

I have a deposit down on a tangerine 1971 911S Targa that is undergoing engine work and some interior work as well (new carpets, seats re-upholstered, etc).

In the process of doing a top end rebuild of the engine the seller (a dealer & a board member, who is reputable) identified that the engine which # matches per COA was rebuilt to 2.4S specs - pistons, cams, crank, etc. As well a 915 tranny was put in (though the original 901 is being provided with the car as well) which I did know upfront.

At first blush this wasn't great news. Extra power is great, but I was going for the originality. That said, I like how the car is turning out, and the color and year are what I'm looking for.

So, couple of questions:

1) Assuming the 2.4 conversion was done right, is there any risk or impact on the engine longevity from this?
2) In the spectrum of non-correct modifications, where is a rebuild of a 2.2S to a 2.4S? How would it impact the car's value if you were buying? If I'm being honest with myself, among the reasons I'm buying is collectibility over time.

To be very clear, the seller has been completely upfront and ethical about it - I am very comfortable doing business with him. The 2.4 rebuild was a surprise to him as well.

many thanks,
Ted