I think Johnnny has the right idea;find a Nova with A/C in a wrecking yard,and get everything you can that relates to your project. That way,you have a reserve of related parts to draw from if needed,and once the A/C is installed and working you can dispose of the parts you didn't need. If the factory bracket doesn't tuck close enough to the engine or something like that,it's often easier to modify an existing bracket than to build one from scratch. Or keep 'em,in case you think of something else you can make out of them.
Speed