69Torino,
I am sure that you are already aware of this but just dropping in a 460 is going to involve matching your bell housing and such. The 429/460 engines are of the 385 series and the one you have is the FE series. If you have a short block, there most likely won't be anythng behind the head on the block. That would depend on the block and year. Even if there is anything it really won't tell you much. You could go to a 750 or 800 doublepumper and see how it works out. May have to change some jetting depending on your cam and stuff. But if you go a reasonably stock 460 later, the 800 can be worked to run really well on them and stay streetable.
Ron
