383 in a 68 valiant200 swap help

i need to find headers or block huggers who makes these besides tti an shummacher wont cut up car for fendwells to clean to butcher. also need info on 2 or 3 core aluminum radiators best construction fit perfomance any ins an outs u had with what ou used to creat a beast mines called frankenstien made from many old mopar parts an cars