What is the difference in push rod length on a 360 mopar with adjustable rockers and hydraulic lifters compared to one with mechanical lifters . Can I use mechanical push rods and adjustable rockers of a 1966 273 on my 360 or do I need different push rods . I am changing the cam and Comp cams says i need adjustable rockers that are $500.00 I can get a new set for a 273 compleat with push rods for $100 will they work.