Turbo Headers on Ebay... I got questions

[Nutsy]

http://cgi.ebay.com/ebaymotors/ws/eB...spagename=WDVW

What do you think? Would these work on 18 degree heads? or just 23 degree heads? Also what about running external wastegates? I guess i could plumb those in later... i am thinking about these for my 69 Camaro.

What about 1 3/4 primaries... too big? Will i get cracking? I was thinking that velocities would be higher in a smaller diameter primary, thus spooling up the turbo a bit quicker while providing better resistance to cracking...

Any thoughts?

Trev