Does your ‘74 have shock mounted bumpers front and rear, or just in the front?
In ‘74 they started with shock mounted bumpers front and rear, but due to a manufacturing issue they went back to non-shock mounted front bumpers mid-year. If yours has shock mounted front bumpers it’s harder to fix than if it has standard non-shock mounted bumpers in the front.
In the rear, you can just get rid of the entire ‘74 bumper, shock mounts etc and save about 50+lbs. This thread covers a lot of that
Tucked in 74 Rear Bumper. All Sorts Of Wrong. I Hate it!
The problem with “tucking in” the ‘74+ bumpers is that they’re wider than the car, so, even “tucked in” they still don’t look right.