The resin pockets may not be an issue. The resins from some trees such as pine are commonly eaten (or made into hot drinks) in certain parts of the world, that's how non-toxic it can be. But without specific info on the exact species you're using I don't think you should make any assumptions.
"Canadian oregon" is better known to much of the rest of the world as Douglas fir by the way.
The nail holes I would be very concerned by personally, in particular because you're using recycled wood. The obvious first worry is they are major voids in the wood which could harbour food waste and breed bacteria. But on top of this you can't know what might have gotten into a nail hole before the wood came into your possession. You're going to have to make a judgement call on whether you think it's worth the risk. Myself, if I was dead set on using the wood I would drill out the nail holes to expose clean wood, then fill them. YMMV.
You say you still need to plane the top of the board, just in case you were planning on sending this through a planer/thicknesser be extremely careful. Although people do get away with this (using certain pieces of hardware, not all planers are made equal) other people have had disastrous accidents trying this.
If something goes wrong the least you can expect is the board being heavily damaged or broken apart, sending pieces of it flying out of the back of the machine at high speed. Although that gives the potential for personal injury this might give you more pause — there's a chance of your planer being destroyed by the shrapnel. So this is not a risk to take lightly.