The damper snout needs to be modified. I do it all the time. Trim about 1/4"-5/16" off the end of the snout and machine the outside of the snout where the seal rides back an equal amount. Then use a big block V8 2-sheave pulley turned backwards over the damper to drive the belts. You'll need to grind two small nibs off the pulley to allow it to sit flat against the face of the damper and use the three threaded puller holes to secure the pulley. PM me for more info if you like. NO- - - -I DO NOT make or sell these dampers, but I'll be glad to walk you through the process of making one.
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!