I have milled a lot of wood with 076s, both double powerheads and a single on. Not exactly the power of an 090, but if you can't find the 090, but the 075 or 076 is available, you won't suffer much. I think it is 111 ccs? The guy that built my mill , Sperber mills, supplied 076's with it, I think he gave a reason over the 090s. After close to thirty years the saws still run solid, or one does, I did something stupid with the other. Subsequently I acquired another one, I have run them hard, full days of milling in very hot weather...no problemo! A fine falling saw for big wood as well. I have an 090G, and have milled with it. Lots of torque, but slow chain speed, being a gear reduced saw. It is also a VERY heavy saw, and with that little can for a muffler, quite loud. I like the 076 better for milling, very reliable for infrequent use, it will always start. If you do get one, some of them came without a decomp, especially the earlier 075.
I also have an 880, but with the 076, there is no need to stick the 880 on the mill. It mostly sits looking pretty and unused. All superfluous information if you are set on an 090, Good luck in your search.
either way I wish you luck in finding a 090.
