70-72 small block motor mount brackets

One side will, the other will not.

You need to find a set of 340 mounts if you are going to run a 360 with the old style k-member.

Huh? 318-340 mounts are the same and the 360 driver side is different. But a 318-340 mount can be used by using a 1/2 nut for a shim on the driver side.