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Hello all, in some of my reading I have found that they are the same and others disagree. LMC truck does sell two different perches for the sbc and bbc. However, the part numbers are the same for first and second gen. My plan is to put a BBC in my 63. There is a guy that is selling used V8 perches off his 67, don't know if they were for a bbc or sbc, or if it even matters. Thanks in advance!
 

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If you use BB clamshell mounts, use the ones from the C20 as they fit better, the towers will need either a spacer put under the frame rail or shorten the tower by cutting and welding.
just a random images from the net..note spacer under towers at the top of frame rail.
 
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