I have a 1959 Chevy 235 block with 1954 head converting to hyd NOS lifters and new hyd cam ccs-5 or 6 not sure which one yet The block is a 1959 truck block The head is a 1954 cast with 1959 rockers and the drilled bolt Good oil flow to the rockers It had mech lifters and cam Any one know the length of the pushrods used with the Hyd lifters Thanks for any help