Packing 10 pounds of potatoes in a 5 lb. sack seldom works well. In order to take full advantage of the 400 stroke the block would need to be at least an inch taller for the piston/rod/crankshaft geometry to work right. At least the Ford 351's and the Mopar 413/426/440's used a raised block configuration when they stroked those engines. Add the fact that external balancing is needed for the 400 strokers and things really get dicey at anything much above 6K RPM. The engine is a torquer- - - -don't even think about winding it up without a big box to haul the pieces home in.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!