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Can tell you from experience, Pacesetters will not fit (w/o notching). If you're good with boxing frames, or want to spend the money, go for it. I hear S&P does custom headers for the OBS trucks, but they're not cheap.
F-body & truck manifolds (w/o AIR & EGR) seem to fit best w/o mods. If someone posts more thoughts, there may be some light at the end of the tunnel for OBS LT setups.
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I can't say from personal experience but I talked to a guy online with the same setup as me who tried Pacesetters for a late model 1/2 ton and they hit the frame on the p side I think.