Clevor was my first choice until I did the numbers on buying and then reconditioning a set of 4V closed chamber heads - also my engine builder was less than enthusiastic.
I think I will revisit that plan at a future date and I have some images somewhere of a clevor build that I will put up if I can find them
In the mean time this might be interesting as a read - perhaps a little out there for the cobra tho..
http://www.cpgnation.com/forum/408-c...rack-2710.html
http://tomsmustangbarn.tripod.com/sbossbuild.htm
(looks similar to Mr Bruces find)
have fun and dont forget to post lots of pics
LoBelly
late edit:
Note: Just in case you hadn't noticed this link is to a manifold for a 289/302 not a 351 per your spec last page - ali adapters are available...