Iron BB Vette manifolds fit a '72 bay?

[mzerega]

Anyone have success fitting factory-type iron big block manifolds in their '67-'72 C-series pickup? I'm wondering 'cause I'd like something better than my ratty, restrictive, old factory manifolds and replacement iron BB Corvette manifolds are relatively inexpensive.

http://tinyurl.com/j4lux
http://tinyurl.com/enpgs

Will they fit without any modification to the truck or manifolds themselves? Any photos of a successful install? Any observations would be much appreciated.

Matt
1972 C20 402