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Mando,
I have a Gilmer drive on my 5.0L Cleveland. Crank is largest of three, Water pump is a little smaller and the Alternator is quite a lot smaller. Sizes will vary on how you want to set up cooling system and charging system at different revs.
Things you need to watch out for.....
1. You dont want to have the Water pump pulley too big as you may cavitate cooling water through your system particularly at high revs. Bigger pulley however, gives higher water flow.
2. If the alternator pulley is too small may not get enough charge to your battery if you have a lot of current draw on your system. If it's too big your alternator will be overworked at high revs. Easy check with volt meter when at idle with lots of electronics switched on.
If you want me to measure my pulley's let me know and I will post a further reply. Hope this helps.
TC
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