BBC with A/C Radiator brackets

[biohazardbill]

So I have a stock 4 core radiator to go into the 67. I purchased a set of used wider brackets to accomodate this radiator. The original core support had rot underneath the battery tray as most do so I have replaced that. Now as I go to put in the lower mounts it hits the front lip of the core support. So I took them and test fit them in the factory core support. Same thing. Quick fix would be to just notch the lip however since it doesnt fit the after market core support and the original core support just making sure I am not missing something as it would be a shame to notch a brand new piece.

Thanks in advance.