Personally, I'd look for the earlier 3 bar castings just to eliminate any problems with spark plugs and header clearance. I've heard there are workarounds, but that's just what I'd do.
Pisses me off that I actually had a set of 3 bar heads from that 84 vert I used to have. Even had the Trick Flow spring kit set up and they were ready to go. For some reason that I don't recall now, I had them on the tail gate of my truck and forgot about them over night. Went to leave the next morning, still forgetting about them until I got to work. I had a patient to take care of right away, then afterward left and backtracked my route. They were no where to be found.....
So THAT'S why I'll be in the market for a set of heads. Otherwise I'd have everything for my vert to go ahead and tear into it.