What's wrong with your old head?
Zimmerman in Iowa most likely has a RD6 head. I believe he also has the sleeve kits.
If not, Regal sells the sleeves, however they need some machining done before they can be used. Otto has the ring sets, and Olson gaskets can get head gasket.
Jim Zimmerman's phone number: 641-982-4207; FAX 641-982-4297.
The RD6 heads, 3b3211 and 2b6480 cross directly to a variety of D13000 engines and indirectly to the 2u D8. so it should work, might need to switch some parts.
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