Re: 400 to 460 truck engine swap
You will need a flywheel for the 460. It has a different flywheel than the 400. The tranny will bolt up. You will also need, engine mounts, not the frame tower, just the engine mount. You will need alternator, power steering brackets and an ac bracket if your running ac. You can buy a kit, or just a few components from L&L products. They make everything you would need for the conversion to go smoothly. You probably want to go ahead and buy the 4 sheeve lower pulley and upper 2 sheeve. Yes...you can go to a junk yard and find the stuff, roll around in the dirt and grease removing the parts, clean them up etc etc. Its easier to just buy the parts you need and not that expensive. They also make a couple headers for it you might want to check out.
I love it when people do things right
Unfortunetly I dont always do that lol