I need to get push rods for my 340 and I have 2 that I am going by 1 is a adj that shows half to 1 tread and the other is a comp that shows 2 to 3 treads which would you use ....I have pic but dont know how to post I would email them if someone would like to post them for me....now ???? would one work better then the other from 1 and a half treads do I really need the custom rods made?????