I scored a 63 289 on craig's with rebuilt heads new water pump fuel pump cam and timing chain list. The 63 block is complete,but the owner took the rockers and push rods out of the motor to make another run. I'm now working on getting the motor together, and have aviailble a 260 valve train out of another 63 motor. Will the rockers and push rods work in the 289 or am I better off buying new? Thanks for the input and reply's ahead of time.