Slant 6 to V8 cooling

74 Duster - original /6 car. Just read another thread on this subject. I have a new stock V8 A/C rad that looks like it is gonna sit too high unless I do some bottom core support cutting. Will also have to drill some new mounting bolt holes ( wider ). /6 core support opening ( width) is also a few inches short on both sides. I guess I just gotta start chopping away. UGH!!