Ford Racing offers high quality Mustang cylinder heads that will give you numbers you are looking for. Because their made by Ford you know the fit and reliability is tough to beat. Ford Racing has been in the performance Mustang market for a long time.
I have been ordering items from Latemodel Restoration for many years. I've found them to be exceptionally professional, timely with order processing and shipping correct items ordered. I've never received an incorrect item on an order.