Honestly..you'd be better off buying a new set of Edelbrock aluminum heads and selling the 64's.
By the time you spend the money on milling them on both intake and block side...you are in roughly $400 right there...not including the cost of SERDI cut if needed..guides, springs, valves, there is another potential $500 to $1000.
I have issue with taking a perfectly fine one year only casting and ripping it down 40 thousandths on 2 sides and unnecessarily writing off $400 just to get down to 80 cc chambers.
If it were me...id sell the 64's as is..you could get 900 to 1300 for them...then find a set of new Edelbrocks. Think about it...by the time you spend the money on iron heads...you could have a new set of heads that will suit your needs right out of the box...have better performance...and coupled with the RPM cam and intake...be pretty stout.
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