Quite an unusual critter you have there.
In response to you wanting to go to a lower compression engine I think you will have to go to a 74 and up engine. I believe that it was in 74 or 75 that GM started tuning down there engines. Although my personal preference would be to rebuild that thing to 70 or prior specs. This will give you higher compression and of course more power. just a thought .
hope this helps, at least a little good luck!
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Landyacht1
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