Hey Jack,
You'll be happy with that Superformance!
Do you know which
oil pan your car has? My 351w has a Canton 7 qt. pan.
based on engine builders recommendations, don't use
synthetic for the first 5k or so. Personally, I have no plans to run
synthetic ever since I only use the car on the street, and in that case,
synthetic is a waste inho. But I always use an
amsoil filter.
Good Luck with your car!