Nothing wrong with a Northern brand rad. That's who makes Summits and Jegs rads. Lot's of guys using the 19x26" in big block A-bodies with good success.
Now Grrrrrrrrrrrriffin is another story. Stay away from them. Any rad with tubes epoxied to the tanks are junk, in my humble opinion.
I have three tubes in my Griffin damaged right next to the driver's side tank. Long story. But it can't be fixed. I took pics and sent them to griffin to ask if they would/could fix it, and they said no, but we will sell you another one. No thanks, I'll buy from someone else.
codfish