I plan on running stock manifolds on my 5 window project. My exhaust manifolds just barely touch my hood sides. Was wondering if need be where I should look for under hood headers. Haven't seen anyone that has them.
Make them yourself. You're probably not going to find anything besides the gear drive lakes headers, that engine isn't exactly run of the mill.
http://www.headersbyed.com/__cadillac.htm http://www.hellsgatehotrods.com/flanges/exhaust-header-flanges/cadillac-331-late-exhaust-flange/
Bell Auto Parts in Bakersfield. He makes them to fit. Had a mock up at LARS. Looked good. 661-872-9039. Had a real nice set of valve covers, too.