8.25" rear axle and disc brakes???

nope $450 is close to what it would cost to completely restore equivalent drum brakes: new drums/hardware/shoes/backing plates


cores are used calipers to exchange when you buy new ones. that way the rebuilder can rebuild anothe set of the caliper you just bought.

if you want to run ebrakes and cant get cores, buy from TSM their price is good on the calipers, especially since there is no core charge.