It looks like you don't really know what the deal is with ford heads/blocks. As said earlier, you don't need 20-30lbs of boost to go low 10's, high 9's. Of course, boost is just a definition of backpressure, so the bigger the head, the less boost you need. If you want to go low 10's, you can do that with any aluminum head and around 15psi boost, and you might be able to keep it together in a stock 2 bolt thinwall block. Once you get beyond 550-600rwhp (with a turbo) you NEED a 4 bolt block. At 550 though, its still borderline on if it will hold or not, but keeping the rpm down helps a lot.
99 black cobra built bottom end, ported NAVI heads, cams, etc. n/a w/n20
93 white coupe- 306ci, 14psi s-trim, tko600
'06 black Subaru STI- spec clutch, blizzak snow tires, 475hp on 91 octane.