Originally Posted by Plaintoast
Depending on what they are going in as far as figment goes, they are one of your better choices for manifolds. I've personally used them on a metric chassis (g body) and I think the passengers side will touch the frame rail. They are fairly wide manifolds but pretty good. As was said by someone else, they have a habit of warping, so instead of junkyard shopping you may just want to order the doorman replacements and save headaches installing them.
I take it you are refering to the stock replacement log type manifolds. I am quite suprised that the old ram horns will work on this application. To be honest I find that hard to believe.
As far as what this engine is going into. Hopefully a 62-65 C-10 so I will have plenty of room for anything I choose. The ram horns have a built in bracket on the drivers side manifold for the alternator to pivot. If I go with the log manifolds I will have to make a bracket for the alternator to pivot. I also wonder about clearance with the starter. I believe a lot of the 5.7 Vortec engines use a Hi-Torque starter which is quite a bit smaller than the traditional stock 327 monster.