the factory 5.3L fullsize truck oil pan will clear as will the factory exhaust manifolds cats and y pipe. i'm in the finishing stages of my 5.3L swap into my 92 GMC k1500 with 98 interior and wiring and the 5.3 fits like a dream. Here's a few pic's that might help clear up a few of your questions. Ans building your own harness is not that bad of a job just very time consuming.
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