I am building a 1957 pick up truck Hot Rod and want a strreetable engine the rods can be aftermarket the pistons was planing on useing 4.125" SBC I can have the crank off set ground but would like to keep the journal size the same less maby .010 " the CAM if a roller set up will gain the effect that the CAM will not wear so I do not lose the CAM profile with time and less rotating assembly rotating resistance the roller rockerarms will be stronger and if correctly made should reduce wear in the guids and reduce rorating resistance ...