8.75 Brake ???

Who ever quoted you $350 for a set may have included blasted/cleaned parts with new shoes and hardware but for a good used setup of 10"x2.5"x4.5" lbp, should cost you btween $80-100 /set. Beyond that I would always recommend replacing the shoes and wheel cylinders as you never know how long the brake fluid sat in the lines absorbing water, both are inexpensive enough that you will not break the bank. At the $80-100 range, you should expect used drums that can be turned at least one additional time and your time to clean them up before putting them on.

Next to next to last, if you can only fine 11"x2.5"x4.5" lbp setup, this will work as well but you need to be consious of your rim size as they were typcially on the big C-Body cars that ran 15" rims.

Next to last, the 10"x2.5"x4.5" drums sets were found on many different Mopar cars and trucks well into the eighties, just make sure that when you get a set, it comes with the emergency brake lever and shoe separator bar as the backset of the backing plate is deeper than the 10"x1.75".

Lastly, make sure that the 10"x2.5"x4.5" backing plates have all five mounting holes to the end of the axle tube. Some later model vehicles eliminated the bottom mounting hole because Mopar used only four bolts to hold the plate to the tube 9(typically on trucks) but don't be discouraged, even though they elminated the fifth bolt, most often I have found the fifth hole on housings with only four bolts.