I think the 11 heads are your best bet. I have 11's on a 350 and it runs great. If you are going to do all this in the next month or so like you say you should set it up for the way the car is now with the 2.56 gear and what sounds like a mild converter. You will not be happy with a tight converter and a hot cam with 2.56's, no way. It will be a dog.
If you have any money spend it on those heads. A good valve job, keep the 30 degree intake seat. Have them slightly milled to make sure they are true, reduce your quench distance, and give your compression a slight bump. Actually, have them zero decked if you can get the help to calculate how far in the hole your pistons are.
With that 2.56 gear in the car I might go with 1.65 rockers and new springs and keep the factory cam.