YOU IN THE RIGHT PLACE FOR ADVICE.IM DOING THE SAMETHING(406 CID) I'VE BEEN IMFORMED TO USE 4.30 TO 4.56 GEARS AND 4500-5000 STALL TO GET IT OUT OF THE HOLE.I BOUGHT AFR 210 HEADS AND THEY HAD COMP CAMS GRIND ME A CAM TO MATCH MT SET UP.CALL COMP CAMS AND THEY WILL BE ABLE TO HELP YOU WITH A CAM AND ATI FOR A CONVERTER.