All the research I did shows the 273 (I actually already had a core to build) will not fit in a 63 as the wiper motor mount point on the firewall interferes with the distributor. I read somewhere where a guy did a full custom distributor but it was a pretty complex milling operation I don't have the tools to get into. I already sourced all the original brackets and engine mounts and exhaust manifolds for the swap when I found this out. Also have the correct drag link as well for a V8 swap. Just decided I didn't want to cut into such a clean body.