That number can be upped quite a bit by using aluminum pistons. The lighter pistons take a lot of stress off of the babbett. I've conversed with an owner of a 39 sedan with the 4.11 who said he cruises at freeway speeds in his aluminum piston 216.

Save a life, adopt a senior shelter pet.
The three main causes of blindness: Cataracts, Politics, Religion.
Name your dog Naked so you can walk Naked in the park.