The 320 quad is due by the end of this year according to MVVS notes. If anywhere near the 152 specific power output, expect about 36 hp at around 6000 rpm on cans.
ORIGINAL: Tired Old Man
Which reminds me, I need info on larger MVVS products. On a line with engines that could easily handle a 75 pound 3d plane. Preferably a quad but if a real strong twin was available, in production or soon to be, it could work. No tuned pipes if at all possible.