Finally get to pretend I am one of the cool kids - Holley kit swap

Dantra said
Those are nice.. pricey tho. I really didn't mind trimming the flange and in hindsight, I wish I would've trimmed mine all the way to the core support. I still might. It makes for a better fitting LX radiator.. I had to roll the flange down to get the radiator to fit. I just cut the flange flush, making the frame rail a square 90 degree edge and then just welded the corner seam together. It's not bad. One advantage is is oem fit, so if I ever have one fail, it's a shelf item.
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Good info. I plan to run an LX radiator as well so I will pay attention to that when I get there.

I'm not so worried about cutting the flange on the '73. I wasn't excited about doing it on the '74 when that was the car the 5.7 was going into but now that I have shifted it is less important. But, if I did end of doing the swap to the '74 later, not having to cut the flange would be a huge bonus.