I've run plenty of 500+ HP 2 bolt engines on the circle tracks- - - -with cast crankshafts, no less! Coming off the turns at 3K RPM and winding up to 7K at the end of a straightaway on a 1/4 mile dirt track, and doing it twice a lap for 50 laps- - - -that's a tougher operating environment than any stovebolt engine swap will ever see. Go ahead and build it- - - -you won't be disappointed!
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!