howdy Doug
almost all of the parts can be found via Mike at
FordSixParts (which i'm pretty sure you guys over at Primedia already know

), Clifford Performance also has some parts
a little ingenuity is the biggest part of getting power out of these engines, milling the head and direct mounting a 2bbl, or (as
MustangGeezer has done) multiple 1bbls
turbos (as evidenced by Will & Kelly's Falcon you guys showcased the other month) are the best way to go for quick power
best way to go (depending on price range) is to:
1) mill off the intake completely and fab up a new intake
example
2) find an Oz 250-2V head (info on those can be found in the
FSP Tech section)
just browse through old threads, you'll find plenty of info
unfortunately i don't think that many people have documented prices
EDIT: by the way, this is the big six section, these are the engines found in trucks and larger cars (cars till mid 70s, trucks till '96-97), a completely different engine