Furnace blower motor RPMs modified... is faster ok?

What is the part number from the manual and the one imprinted on the motor? Also a picture would help.

Have you tried to have a mobile tech fix it, some have really great access to obsolete parts.

My 21 year old furnace fan motor froze up one night in Hill City, dealer said obsolete and I'd need new furnace. Cost $200 including labor in Elkhart. Some folks don't want to help, it's faster, easier and less liability when replacing the entire furnace. More profit too.