383 on ABody BB KFRAME?

I picked up a big block factory K-frame years ago hoping to do a swap. With the info I was told it discouraged me and I never went through with it. I heard that A-body big block carss used the C-body blocks that took a different driver side engine mount. I've never seen a C-body block so can't confirm this. Maybe someone out there will have some experience on this. I looked at all my big blocks and all of them has the bosses/tabs and are drilled.

BTW, original Hemi blocks do not have holes drilled on the block bosses/tabs for the engine brackets. I just looked at my block and the engine mounts bolt directly to the side of the block. Interesting.