Hey Kelly, I appreciate the info on this left-hand amount. I just got their amounts in the mail, and looked real close at my block. I do not have the boss under the head as well. I'm going to call them and see if I can send back the left-hand mount they sent Me and put it towards the mount that which will bolt to the oil pump boss after I drill it in tap it. Thank you again for the info. I just realized I am not in a tight spot as I thought.From engine-swaps.com for when you want to put a big block into your 65 C-Body that doesn't have the mounting bosses. They don't advertise this solution because they like to send out the instructions so people can know what they are getting into.
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I called them and explained my situation. They just told me to send back the left-hand mount that I received, and they would send me the proper amount for my block. So it went into the mail today.I drilled my old block for that mount, it wasn't too bad. Get a couple good bits, some cutting oil, and a good tap.