Not Ranked
David,
I am not sure how much they differ between manufactures, but with my SPF 289 FIA using the 3" tubular frame and transverse leaf springs, I did not have to trim anything off of the bottom of the Quicktime bellhousing and have had no issues on the race track. The trimming of the bell housing might be more of an FE concern.
Safest bet would be to call Doug at ERA.
Jim
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