[Stentor]

Genesis refers to the engine block; Genesis is one of the main manufacturers of modern-day 427 blocks (along with Pond and Shelby).

You can do a search on this site to see what's been said about Genesis blocks (I've got a Genesis 427 and a Shelby 427, and had no problems with either).

The engine components and builder are probably more important than the manufacturer of the block. In that regard, do a search on Performance Engineering (PE).

I believe Dynamic is still the largest SPF dealer in the US, and I suspect Performance Engineering does a lot of their engine builds/installations (as PE is located right behind Dynamic).

What's the difference in finished prices between the SPF and CSXs at which you are looking?