I need a little help/advice

Badsport and BoutTime,

If you have LBP front and SBP on the rear, somebody has put 73 and newer disc brakes on your car.

Check your data tag..
B43 is disc brakes
B41 is power assist

On 73 and newer A-Bodies.........
Drum brakes were the standard set-up on Slant 6. You got a 5x4 inch bolt pattern and a 7.25 rear end.
Disc where standard on V8 cars. 5X4.5 bolt pattern

If you ordered disc brakes on a Slant 6 that got you the 5x4.5 inch bolt pattern.

If you ordered power brakes, that immediately upgraded the brakes to disc.

Power brakes were standard on 340 cars and mandatory on 318 A/C cars.

http://www.hamtramck-historical.com...hAdvanceInfo/73_Plymouth_advance_Info0002.jpg