Just bought a running 3/4 ton with, what I believe is the original straight 6. Has a four speed with a granny low. Looking to convert to a 350 or 4.3 and disc breaks up front. Having a lot of trouble finding parts for a 3/4 ton. What to lower front and rear also. Can u just use 1/2 ton parts on a 3/4 ton frame. New to the forum so I apologize if this has been discussed already. Any advice would be greatly appreciated. Thanks.