Just something for you and your engine man to check out is the intake on a slant six Chrysler. I'm sure they were in the same size range and had a very nice curved runner design. If I recall correctly one was offered with a four bbl from the factory. They had a runner for each of the six intake ports so the design is completely different but maybe some knowledge could be gained from profile and length of the runners. Here are some pics of manifolds already available with curved runners for 235/261 chevys. The 3rd shot has one in the foreground and the 4th shot has one with air cleaners in the background. http://s32.photobucket.com/albums/d41/coilover/


Evan