Hi,
No problem, that one was fresh in my Grey matter, lol
I have heard of people over boring a 401 to a 425, but hopefully they sonic checked the block, worst case it always could be sleeved to save a numbers matching block, in the future. You might want to check what information they have on the engine build if the rest is to you're liking, clean 65's are hard to find, usually the window channels front and back windows always need some work.
Best of luck with your search,
Jim