Louis Belanger did mine so this is second hand, but if you have issues with the final collector going through the center of the hole going into the sill, don't forget that the motor mounts adjust so you can raised or lower the engine on either side and get the headers to point how you want through the holes. Lou puts them slightly low on the drivers side (toward the bottom edge of the hole) and slightly high on the passenger side to compensate for the engine torquing in the motor mounts. Due to an install of the previous Edelbrock headers, my engine was about an inch high on the passenger side and Lou lowered it down when he installed his units. Here is a picture of the collector entering my driver's side sill:
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