Reading your post, I don't see where you say which manifold isn't straight. Maybe I missed it. If its the intake that has a gap, that certainly will cause a problem of low vacuum which will affect fuel to air mixture, cause it to run lean and hotter. If its the exhaust, not so much beyond noisy. As far as torqing it down harder to get it to formed into place, don't go harder than spec, you could crack or break it. Intake manifold vacuum is generally pretty low, enough to cause turbulance to mix the air and fuel, but you absolutely need it. To me, seems kind of odd to have an intake manifold warp because they generally are a cooler part of an engine. I'd say try new gaskets, and Permatex No. 2 (NOT No. 1).
Bottom line is if the intake leaks, gonna run lousy. If exhaust leaks, louder, not worse.
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Today's Featured Article - A 1937 John Deere Unstuck - by Gary Hickman. Here is my story of how I got the pistons out of a 1937 JD B that the engine had been stuck for about 14 years: About 12 years ago my Dad gave me one of the tractors I ran as I was growing up on our farm in central Nebraska. The engine on this tractor, a 1937 John Deere "B", had been stuck for 2 years before he gave it to me. This last spring (1999) I hauled the tractor to our 2 acre lot in St. Libory Nebraska where it joined my antique machinery collection, at that time a 1929 Caterpillar T
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