[misfit41]

I have an eldebrock water pump and I believe the same ati dampener that you do.I am using march pulleys with a stock ford fe alternator and mounting setup .My top pulley belt groove is 5 and 5/8th inches to the block measured from the machined flat just over the passenger side water pump port to the center of the pulley v groove.
The lower pulley measures 3 and 3/8's inches from the center of the v groove to the flat between the mounting bolts on the stock timing pointer.
I also measured a different engine on the flloor that has the same water pump but all stock steel pulleys,all measurements are identical.
I hope this helps,I'll be glad to take pics if you need them. ,Tim