I saw a part of an article on this builder in one of the "Mustangs and Ford" magazines I have laying around, I think they said they're the new kids on the block, but I guess all builders have to start somewherem and a magazine is a heck of a place to start. I checked their website for prices on a 351 Windsor, but from my understanding, they only do 302 stroker combos. Since you live in Maryland, maybe you could get one of engine factories cobra motors and save a little on shipping. They are very respected on this website, if I wasn't doing the build myself, I would get their 427w for the Cobra. I think their website is:
www.fordcobraengines.com/ they also advertise on this website.