IMHO! You may have some valuable stuff there if the wood is: sound, well aged/dry, free of defects that would make it dangerous to turn and has any character. That stuff is hard to come by. What is for sale on line and at the local retailers is most often green or barely dry and extremely pricey if the figure is anything above average.
Boards? Sure, you will be competing with the retailers and the online market. And shipping will often be a real problem.
Turning blanks on the other hand are often not a huge problem to pack and not too expensive to ship.
If you have any concerns about residual critters, let the stuff sit for a few months and look for critter dust. I've had my problems (we all have) but the beasties often reveal their presence pretty quickly. If your Dad ran the stuff through any kind of drying process a while ago and you DIDN'T notice any critter dust (little piles of fine sawdust), I wouldn't worry too much.
Best advice I've seen here is to make the trip to a local club with a few of the best pieces and a few of the less-best and see what kind of input you can get before and after the regular meeting.
Then pick a nice bowl blank, take good pictures and run an ad in Craigslist for your area. Pick a price that pleases you. If you get a bunch of replies and a quick sale, maybe you priced it a little low. No replies? Too high, drop the price by 20% and try again. Doesn't cost you anything.
If storage is not a problem, this stuff just gets more valuable every year.
Good luck,
Tom