I have a SBC 350 with TBI that came out of a 95 surburban that im rebuilding. I took the valve cover off and noticed a good amount of sludge build up on rockers and valve springs. What is the best way to remove the sludge with out taking it to a shop? I'm also thinking of putting new heads and camshaft what would be the best with out haveing to upgrade to fuel above 87.?