DaytonaTurbo and RapidRobert, thanks so much for doing this!

I think its important to note that the high swirl LA head templates are NOT for all LA heads ever made. They are designed for the later model 308 and 576 heads, or the P series 459269, 5249767, or 5249574 heads ONLY. Use of these templates on any heads made earlier than the late '80s could run the risk of thin walls and water jacket penetration.

One of the best summaries I've seen on small block heads is here on moparts: http://www.moparts.org/Tech/Archive/smallblock/23.html