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If the gasket is for an 066 I would think so, as long as you make dang sure its centered right. It MIGHT help determine if the case is wide enough for the piston too. Good luck. Again, keep us posted, Im very interested in your project.
+1. I am also very,very interested as i have a 064 on its way to me with a blown top end and i have asked the same question last week here in relation to swapping out the 064 P & C for a 066's simply due to availability of the 064 top end. Truth be told, the cylinder on the saw now may be salvagable. Pls keep us updated with the progress reports.