Grandville,
You could pull the good impeller off your old pump if you have the three balance holes. I made up a puller and got the impeller off a '73 pump and a '68 pump quite easily. The bolts in the photo are 5/16" with the heads ground to a T shape so they can be finagled into the balance holes. I clamped the pump in a vice with the impeller up, poured water in around the seal, and heated the impeller hub. The water stops the seal frying.
Malcolm
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