Okay I'm building a 1957 312 y block and need some push rods, I've found about 4 different sizes so far that all claim to work with the 312 y block. Can someone steer me in the right direction of what push rods to use. I will be using ECG-C heads at the moment with normal rockers not high lift as that is all I have on hand at the moment. So far I have found 8.259, 8.129, 8.34, 7.967.