Yes they seem to be bloody hard to find, Ive been pouring through this parts mag for days now, and there are only a few references to the 427, mostly parts for it not the engine :(
Mmm I think you're right MJ355, that 427 in the Eagle auto add, mentions nothing about it being a truck engine, if I buy the engine from dirty rat, Im guaranteed it came from a Vette :22 And start from scratch.
As for transmission, I plan on running a 3.73 or possibly even a 4.11 diff, so Im going to go for a TH-700R4 because of its overdrive to keep the revs a little more friendly.
Is there any way of getting in touch with Dirty rat? email?