383 will work its not a drop in sometimes you have to run a small base cam .the rods if a storker H beam will take no work to the block or less work .or a cap screw I beam rod will work but you may have more work . you can run the 6 inch rod or the 5.7 rod thats up to you . as for the head you meen world sportsman II heads not darts? i would think they will work ok but i would do some work to them. gear it for TQ. them heads may loose some steam in hirer RPMs