The BRP mounts allow you to shift the engine as need be, BRP doesn't use the existing frame holes and requires you to mark and drill holes after deciding where you want to place the engine. The BRP mounts also place the engine higher so you can use a GM oil pan (LH8 I think). But the GM oil pan still hangs below the crossmember. The Edelbrock mounts keeps the back of a LS engine is the same place as a Pontiac engine, so you could bolt a Chevy 350/400 transmission in with no crossmember changes.
To answer you question, you probably could keep the factory AC with the BRP mounts, by placing the engine farther forward. BRP also claims you can move the engine far enough forward so the AC compressor can be kept in the stock location without having to notch the frame.
I have the BRP engine mounts and crossmember and it’s for sale cheap if anyone wants to buy it.
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