Re: what engine perches with factory manifolds?
See if you can find some used Trailblazer SS manifolds. They have pretty much the lowest overall clearance required. The big hump and angle of the flange make them tough to fit.
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'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING 
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