Motor Mounts

You can use the rubber insulators for the 68 318 with the 360. The only difference between the 360 and 318 is the driver side engine bracket that bolts to the engine.The block casting,driver side is a different width on the 360 from the 318.
Same goes for a 340 block,it's the same as a 360.As far as brackets go.
Rock Auto on line is one place to look for the rubber insulators/motor mounts.