[FireSale]

Interesting...

Stock reads:

FENDER SPLASH PANS
Mandatory. Can be trimmed to allow a maximum of 2 inches
clearance around headers.

Super Stock reads:

FENDER SPLASH PANS
Must be retained; may be trimmed to allow 2-inch clearance
around headers. Alterations to shock or spring towers prohibited.
See General Regulations 7:3.

Both reference General 7:3 which reads:

7:3 FENDERS
In Super Stock and Stock, the leading and trailing edges of fender
openings may be trimmed for tire clearance, maximum 2 inches. All
vehicles in all classes must have re-rolled or beaded edges on altered
fenders. Flaring or spreading external fender lines prohibited, except
as noted in Class Requirements. Front fenders may not be “drooped”
on full-fendered car except as noted in Class Requirements.

I think Stock is a word processing error and you can't trim the shock towers. Take a photo and email it to your local tech and see what they say.

Dale