the 429/460 are the same engine family, 460 being the most common.

If you are considering a swap, there should be a wealth of information in the Performance, Engines and Troubleshooting forums:

www.ford-trucks.com/forums/forumdisplay.php?f=9

I wish I'd known about FTE when my buddy bought his '76 with a 460 swap. It could have saved him a lot of time and effort.

FWIW, 460s seem plentifull here in the metro area, prices are competitive.

www.pullnsave.com/partspricelist.htm

Where in Colorado are you?

Mike