Good mild 318 build plan?

kid, the build looks fine from where I sit. In fact, while you can port the heads, I think you'd do better to leave them as is, and have a really good performance valve job done on them. That by itself will do about the same as a stage one porting job. I love teh Thermoquads. I've run a bunch. There is a book on how to race and tune Carter carbs.. one of those HP books. Get it. You will want to rebuild the carb, and make sure the primary throttle shaft is not too loose in the casting. If it is, look for another one, or buy a new carb. Keep asking questions. you're doing fine.