360 engine core question

I have an original 318 car... will I have to modify my engine mounts to make my 360 fit? Or will it bolt right into the original k frame? For some reason I recall having to cut part of my k frame to make it fit??? Any tips or links for the custom mounts?
The drivers side rearward ear needs a mod to close the gap when using the 318 mount or you could chince it and use washers...lame.