You need to think about the headers since there are low deck and RB engines then there are standard port location and raised port. So if you are going to run an off the shelf header you might want to sort that out first. If this is a low deck engine then perhaps you'll want to go with a SR head and use a TTi header.

A low deck 512 with 13:1 compression and TTi headers should make 750 to 800 hp with a set of ported SR heads. Low deck intake choices are slim so that is a downside.