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I got #7 cores (no valves) and #7a complete set off a running '72 engine...but I'm in Houston, TX. I would be willing to ship them to you, Fastenal might be the cheapest method.
HO84:
I paid $250 for these for my convertible project; then I decided to build a 375 cid stroker with aluminum heads. I'm just looking to recoup my cost. They weight about 60 pounds each and would ship from 77057. What do you think?