i have a 93 with the vin w. I have to get a shortblock...i found one that has been rebuilt locally for a decent price, and my question is...the engine the guy is selling i guess isn't a roller motor like mine, so what would be needed to get it in my blazer...i know im gonna need different push rods... but is that all? do i just slap my heads on with the longer pushrods, and go? do i need to change my valve springs? also i would like to put a cam in it "while im in there" but i cant find any hydrualic flat tappet cams for the 4.3...They are all hydraulic rollers...what would be needed to swap cams? keep in mind that i have a roller block in the garage now for parts...