A radical cam and multiple carburetion kills the torque, except at wide open throttle. Run a 261 "as manufactured"- - - -the engineers who designed it for big truck use were smarter than a bunch of guys who have read at least two copies of Hot Rod Magazine and attended a swap meet recently!
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!