Put a Champion 526 radiator in a 71 swinger?

As I recall, with the battery tray in the car the radiator won't drop straight down in on install, but once it's lowered down to the right height it doesn't interfere. I had mine in my Duster when I still had the battery up front and I didn't do any cutting on the radiator mounts or the battery tray.

My car also left the factory with a 22" radiator, I used a stock 26" radiator to locate the mounting holes and tack welded a couple of nuts onto the radiator support like the factory did. None of that is really necessary though, you can just use a couple of shims to level the radiator and hold it up off the support while you drill some holes in the mounting ears and radiator shroud.