what motor are you buying? you got to buy all stuff plus serpintine belt. and all accessories for it to match. i bought a zz4 motor for my 67 camaro and change water pump to old style it fit besides grinding heads on 2 bolts for water pump to fit. all pulleys did fine on aligning up than. but going to serpintine belt you need all acc. before selling complete with all put motor in and buy whats needed may smack yourself in head later on.