Originally Posted by 20/20 vision

be carefull and check that the lugs are in *precisely* the same position relative to the keyway.

I had a 36-1 V belt aftermarket pulley and later replaced it with a stock cast iron one which has the teeth cast into it (in order to run a ribbed water pump / alt belt). never gave it a thought but discovered later that the engine had been running 23 degrees advanced because the missing tooth gap was 23 degrees different on the aftermarket wheel compared to a stock one