Lots of folks swear by their product. My 392/430hp ran great til I blew a head gasket, bent a rod and spun a bearing with 7200 miles on it (reason still unknown). Yes I was at a track racing (but 50psi
oil and under 6k rpms). Those things happen.
For the same money as the Ford Racing motor, you can get a Keith Craft 410 stroker that will put out +/- 525hp.
Man O War has similar packages too.
Just a thought.