I've seen countless red oak boardbows, many being great performers. I've seen an 80#@32" red oak board bow, wich was pretty short for it's drawlength, and even having a stiff handle. So I'm pretty sure it'll work. A flat belly, with a flat back and top-notch grain will be a great start. for 100#+ I'd start with 77" ntn, and 1 1/2" wide at the handle. A good temper will reduce the set and increase the performance.
If you're unsure about the grain, a backing might help, but I don't think you'll need this if you've found a good board.
Nick