[nacho55]

I have a 5.3 in my AD truck, with an S-10 Front clip, and if you are handy with a welder you can cut off the factory flanges from the cast iron manifolds and weld on a a different collector,(yes you can Mig weld cast iron if preped right) i used some steel v-band flanges and clamps and worked out good for mine, a person could also weld on a bend or elbow in a different position and put on a different collector on to be routed a little different to get you the clearance you need.
Just something to think about,