Sounds like it is a 71 model 429. all you have to do to make it a 460 is pistons and crank. the rods are the same. i have had several. I do not build 429s because it cost the same for 30 cu in more, all you need is the crank. you will need new pistons which ever way you go.it should be a good reliable motor. I went 9.30s in the 1/8 with one in a 6500 lb van. used it to pull my race car.