Having bought and sold 2-3 of those exact cards, and collecting BBs for the last 2 years, here's my thoughts:
I would submit them to PSA rather than SGC, especially if you are planning on selling them. I know that most people here love SGC (and I do think they are a great option for pre-war), I think you'll do better sale wise with PSA. Either way, though, you should definitely get them graded.
As far as $ goes -
The Bond Bread cards aren't commanding what they once were in the past, at least in terms of auctions. I would list them as a BIN on eBay with Best Offer, and stick to your guns.
I sold my PSA 1.5 for $400 I believe. I sold my SGC50 for just over $1000.
I think yours would both grade in the 1.5-3 range, so Sean's estimates are pretty solid. If they came back as 3s, I would probably list them as BIN for $800, and see what kind of bites you get.
You are a lucky man to have come across them for free. The person who gave you those didn't happen to have the Throwing variation, did they? It's the only one I need for the set.
Here are my old cards, and my current one:
