I have a freshly ported 066 flat top, non decomp.
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R is the arctic model in some generations and just full wrap with west coast clutch cover in other eras
the rescue model is the 460 only and is the MS460 magnum rescue
No fears dealing with Shaun he builds a saw that will fetch the mail and might bite the mailman too.
I had an 066 for a while he ported ..very strong saw..had a meteor jug too.