Your OK as long as the car was level. That gap you have between the floor worked out good on my Duster. I ran the Park brake cable above the frame tie. I saw the US tool style. and thought about the brake cable because the are formed to the floor. They would be good for a race car . I wanted to keep the parking brake. You'll be OK. I welded mine in on the lift years ago . It was easy for an old guy. Doors still worked perfect and the car launched straight wheels in the air.
I have a Valiant coming . Race car went to a race shop. Paid big money for made stainless fenderwell headers. The cut the down tubes off under the hood. They had it on the ground and welded new down tubes in. When he went to pick the car up the right rear slick was flat. They pumped it up and the right front tire came off the ground. After going to look at the car to repair it we saw they even had to make two different length down tubes. And still didn't know the tire was flat.
so setting the car on the ground is not always the best. Jack stands under the rear are not good either when you have super stock springs . My car leaned hard to the left with those springs. we are making a 108 and 111 rack out of Mario Andretti's Sprint car frame straightener to put these A-bodies cars on now. We went to 3-n-1 Race weld in Nazareth Pa. and bought it just for this reason. I really think you'll be OK as long as your lift isn' bent bad.
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