First Stupid question... Suspension Swapping

[javadoc]

I'm probably going to go do it anyway, because it's a good deal and I could sell them off if they don't fit but.... a guy's selling Belltech springs (2"/4" drop) and Nitro shocks for a '69-'72 and I gotta think they'll fit my '64 just fine, right?

Just got back from a 60mile r/t to get a bed for one of my kids, and ohhh man, that truck needs shocks, the thing bounces like crazy. Killing two birds w/one stone (dropping the ride height plus new shocks) would be awesome.

Sooooo... Will they fit?