I used this engine:
http://www.summitracing.com/parts/nal-19210008 It has a 670 CFM Holley I'm not sure how the holes in the block and heads compare with the one you are looking at. You'd need to compare. If you run headers that creates other significant problems for your A/C.
On my 69 with ram horns, all the short water pump based brackets except the A/C top compressor braces bolted on. The problem is that the Vortec heads require an intake that is secured with bolts at a 90 degree angle to horizontal. Since there were 2 different A/C bracket sets used from 67-72 it would help if you could post a pic of yours. The brackets I used were the most common, and, I think, the only brackets used by 1972. I fabricated 3 pieces to brace the compressor. I have a template of the most complex one. However, you may need to modify it for an Edelbrock intake. I can post pictures if that would help.