Go with a speaker rated at 90db or higher , this should work well with the Mac monos.
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JBL 43xx series and 6L6 are big buddies since long. Plenty of restored units will humiliate B&W 805S. In fact that I really like B&W 805S in particular, the JBL43xx series will be better match.
Floor stander I'd pick JBL L800 if you'll be able to find it.
My favorite pick on tubes is 6CA7 fat bottles.
I absolutely would not use EL34’s in an MC-30, unless it has been somehow modified to be compatible with them. The MC-30 was designed for the 1614 or 6L6-GC. The EL34 differs from those tubes in numerous ways, including not only electrical parameters but even the pin to which the suppressor grid is connected. The pin-out difference could be resolved by adding a jumper between pins 1 and 8 on each of the power tube sockets. But I would expect the differences in electrical parameters to result in degraded sonics at best, and a blown power transformer at worst, eventually if not sooner.
Good luck. Regards,