Agree that most likley you'll need at least 80-84# spine, maybe more/maybe less depending upon shooting characteristics of both the archer and bow.
My rule of thumb for high performance bows was always add at least 10# spine right off the bat, then another 10 for the extra arrow length so that puts it right at 80#.
Best way to find out is fletch up some different sizes and shoot them with broadheads. If they fly well with broadheads , field points will surely work.
If you can find 11/32" sao much the better as quality of shaft will be superior. Most likely though these days you'll have to go to 23/64".