Can anyone tell me if the b&m v-belt (3 groove / marine applacation) pulley is the same for a b&m 250 and b&m 174 blower. Also, is the spacer the same that fits in the v-groove pulley that the drive pulley mounts to. I'm looking for a 250 blower v-belt pulley for a bbc and found one but it's for a b&m 174 blower. Thanks guys!

Should be the same. Most pieces for these B&M/Holley blowers are still available new if you really dig on the net.

http://www.holley.com/data/Products/...9500488-00.pdf