Since the 250 is actually SHORTER than the 235/216 length shouldn't be a problem. For those who will disagree, See Leo Santucci's book on building the L6. I don't believe Tom Langdon carries the 250 mounts any more, but you can get the same ones from Chassis Engineering. Stock, you get 155 HP, 2 more main bearings, full flow oiling, and easy to get parts. It's a great swap, and one of the easiest. Have fun!
Best wishes,
Les
