With a little bit of tinkering, you can install screw-in rocker arm studs and roller-tip 1.6:1 ratio small block V8 rocker arms on the 250 head. That will really wake up the engine.
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!