The 250 will have better low-end torque. The 230 will have a higher RPM capability, so the weight of the vehicle you're running and the final drive gear ratio will determine which engine will serve you best. I can probably get the same horsepower from a modified 230 as a basically stock 250, but it will be turning noticeably faster RPM. A short stroke V8 like a 302 or a 327 can outperform a 350, but it has to be modified, balanced, and wound up like a bumblebee on steroids to do it!
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!