All shrouds exit the mold needing edge trimming.
Most come out of the box looking like this (hopefully not distorted):
However, the final fitment requires install holes as well as six cutouts for the intake system (EFI or carbs).
A Dremel tool with carbide cutter and sanding drums:
If an amber shroud appeared on your recent rebuild, someone spent time for a proper fit. Add a few hours onto the rebuild schedule.
Sherwood