'68 Barracuda Formula S Fastback Restoration Background

I run Edelbrock heads with the early cast iron water pump along with the '69 and earlier water pump and crank pulleys. Not understanding why you had to go with a '70 up water pump?
I couldn't get the pullies to line up with the E-Heads. I have only 1/4" clearance between the alternator and head with the alternator spaced out for the '70+ WP. I wonder if Edelbrock changed the machining in some way.
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I simply don't have 3/4" room between the head and alternator as it is right now. Any help with this would be appreciated as I already have clearance issues with the WP snout. Also, I would like the WP outlet on the other side but that means changing the radiator.