i am almost finished building my 318 for my truck i would like to possibly get some adjustable roller rockers later on maybe with a 1.6 ratio instead of the stock 1.5 i have a small rv cam with a .40 over block and j heads is there anything else i will need to do before swapping rockers like a stall converter because of more valve lift from a different ratio or would it just be better to stick with a 1.5 ratio rocker also has they say clearance may be an issue what might i have to have machined to get the adjustable rollers to work i know i have to get new pushrods and i already have hp valve springs i just want to know what im getting myself in for.