O'Beer Miester...keep your eyes peeled on the Corvette forum and LS1tech for lightly used LS7 take out clutches. There's some good deals on there from time to time.
Speedtech sells the firewall bracket which allows for the angled 4th gen clutch master to be used:
http://www.speedtechperformance.com/...rod/prd256.htm
OTOH, if you want an adjustable master ($$$), Tick or Macloed are your best options.
Last point, I'm wondering if the Goat TO bearing is any different? I know there are specific part numbers for starters which makes me wonder if the Bell or tranny input shaft is different?
Anyway I'm following along and rooting for your success!