motor mount help!!!!!!!

Hey guys i have a 73 small block spool mount k-member that had 318 mounts in place.Now im swapping in a 69 340 motor and i just realized that the mounts are different.The 69 motor has 3 mounting holes on the block and the 318 mounts have 4 mounting holes. I thought (assumed) that all small block mounts would work with all small blocks.I guess my question is does anybody have mounts for a 69 block that will bolt in my 73 spool mount k-member.
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