Issues with pre - 70's 318 in a 73 Duster

banditluda said

I already have the alternator mounted and all that. The only issues unresolved the radiator and power steering. I purchased this style water pump new and have everything painted to match, so if I can find ways to work with what I've built, I'd prefer that method.

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I would bite the bullet on the late 60's style cast iron water pump and change it over to the 73 timing chain cover and aluminum water pump, then all the other accessories in the car will bolt up to the 73 configuration...

You could always resell the cast iron water pump here and get some of your money back from it...