i just pulled my old motor out of my car the other day and i bought another 5.0 to drop in so i could build the one i just pulled out. im looking into doing motor mounts but not sure if i should go with the stock rubber, urethane,or solid. im going to run the stock 5.0 for about a year or 2 then put the motor i build back in which im trying to build around 600hp. just wondering what i should use.Thanks.