What wouldn't be an insulting offer?

Ottmundr said

I'd go with the lower mileage engine, and offer $500. If he bites, great. If not, he'll come own some. You can always get some 915 heads later if you want.

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I think lower mileage would be best as well, simply because it's not a ton of wear and tear, if I can get it for a good price, should be good too.

This was pretty much the answer I was looking for. If he wants a trade I have BMW shell + $100, or $500 cash. Thanks for the help.

What's the difference between the 915s?