I have a question of price vs performance. I have a mildly built 468 chevy big block with 9.5:1 compression. The heads on it are Chevy production aluminum, rect. port from the early 70's. I know these heads are way too big for this application, but how much would I gain in HP and overall performance by spending $2000 on a set of oval ports. On that same note, I have a set of 049's that have never been worked on. By the time I spend money on new seats, valves, springs, etc., I'd probably be ahead by buying a new set. The factory aluminum heads have 124cc chambers so I could gain a little compression by going with a 119cc chamber not to mention better cylinder fill. If there will be some noticable improvement, I wouldn't mind doing it, but if it's just minimal I don't need it. Can someone give me an idea?
Sorry for the general description, but I don't have the numbers right in front of me.