No offense but I find a little humor in this post. You're looking to purchase a set of 185 heads because you can get a deal on them. However how much are you going to spend to make this bargain work? Adding a bigger cam, possible flycutting pistons. Are you going to flycut used cast pistons? Now that you've torn the engine apart are you going to leave it as is or put new bearings in it? Would you bore the engine out and add fordge pistons because you'll have a high RPM screamer? Looser converter, steeper gears all need to be added in as well to make this package work.
Rebuilding and porting your stock heads would probable be sufficient but again praticality rears it's ungle head because the amount you'd spent on refurbishing the stockers, would be a very nice down payment on a set of aluminum. IMO, buy the right head to begin with, you be way ahead then trying to make a bargain work.
I'm not a complete idiot, pieces are missing.