Was thinking of a pair of mono block 140s...Yes - a full size will fit , or 2 half size will. I ran my 62 and 140 like this for years , despite it not being the optimum distance apart.
My local Naim dealer chastised me for doing so - and he was actually right - but I guess it all depends on how keen you are on squeezing the last potential drop of goodness out of the system.