[misfit41]

I am running pent roof covers with holes and breather caps in both,the intake fill tube and rear breather fitting are both closed off.
Whats the best set up ? I would like to go to solid valve covers,a breather cap on the intake fill,and one of the stand up cast aluminum breathers in back,is this correct ? or should I run a pvc system ?
any helh is appreciated,,,Tk