It can be done with everything in place. I don't recommend it. If I could do it again, which im sure I will have to do eventually, I would tear everything off after the frustration and contortions my arms went through.
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1967 GTO- 400ci of PONTIAC iron, 4bbl 770 cfm holley,670 heads, headers, 4spd, and a busted fender.
2005 GTO- 400hp of corporate ls2, lingenfelter intake, Corsa sport exhaust, reprogrammed tcm, Boyd Coddington Smootie II's, and a crap load of zaino! 
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