Okay here's the deal. I have a friend doing a 5.0 it a 4 cyl fox, he put a e303 cam and 1.6 roller rockers. he doesn't know what length push rod to use it's his first try at a 5.0 build. heads are gt40's and stock block, can someone help me out with the correct length of push rods he needs so he can finish his engine.