I have an 18 deg sbc with a 3.800 stroke and it likes 8000 rpm a lot,a 3.260 stroke 18 deg I think titanium in&ex would be a good thing.About pushrods,the more ratio the rocker arm has the harder it is for the pushrod to open the valve,and the easier it is for the spring to return it.So when going to higher rocker arms stronger pushrods is something to think about,lower ratio might like lighter ones.Bill.