Hey Hot Rod Dad sounds like a good swap I have a 56 two ton that I put a big block in not finished yet but have done a lot of research on the subject. You may want to check your transmission alignment before you drive your truck. The bell housings that fit this application changed in 67 for the new SM465 witch has a larger pilot hole at the rear of the bell housing so you 420 will not be properly centered. I believe that Advance Adapters makes a spacer ring to run the 420 in the later housing. If you have used the early housing your 465 will not fit in the smaller hole.
By all means get us some pictures we want to see, if you want to see my 56 just check out my webshots page there's lots of picture of the project to include steering and brake upgrades and yes there are some with the monster big block sitting in its place.
Last edited by HevyHauler; 11/22/2007 7:22 PM.
