Here's an unfinished photo of what I did. Not sure if you would call it "frenched in". I just cut enough frame out to put the front edge basically flush with the frame.
I got the rear axle in with the ubolt flip done and I'm super happy with how soft the chevy springs are!! But I'm saggy in the rear, bad.
I'll add another pic later. I should've put the front in there too. The front is easily 3-4 inches higher... Other than blocks.. Any ideas?