I've got a 1989 Mustang GT with a blown head gasket. Since everything is going to be pulled apart anyways, it seemed like the perfect time to replace the heads too (not doing this myself). Ideally I'd like to spend under $1,000 for the heads (already spending more than that for the repair) and find something that can easily replace the stock heads without modifications needed to other parts of the engine. I know more about cars than many people but I don't know enough about this part of the engine to determine on my own which heads will suit my needs. Can anyone give me some good options? I've seen GT-40p ( or just GT-40??? ) heads thrown around a lot here, is that something that would easily work? I guess I'd have to get those from ebay though which I'm a tad leery about.