Originally posted by 64 in progress
So I can actually put these heads on a 460 and it would be the same thing? Someone is giving me a 460 out of a 1973 Lincoln. Is that a suitable donor for these heads. If I can swap these heads onto this motor that would be easier than swapping the crank and pistons right?
They will bolt to the 1973 460, but this does not make that engine a "460CJ" (so to speak). The 1970 429CJ had slightly different internal spec's than a 1973 460, but yes the heads and complete valve train from the 429CJ may be transferred to the 460 shortblock.

The 1970 429CJ has a different intake manufold, different cam profile, flat-top pistons, and (although not a big deal performance wise) slightly different rods which are not any stronger than stock rods.

The 1973 460 has 22cc dished pistons and a milder camshaftand different intake manifold.

The 1973 460 has about 7.9:1 compression ratio and th 1970 429CJ has about 10.7:1 compression ratio. If you bolt the CJ heads to the 1973 460, you will have about 9.4:1 compression ratio. In this particular case, it is mandatory that the entire valve train for the CJ heads be transferred along with the heads themselves.

Paul