center it up and weld it in then take a peace of 2x1/4 flat steel and go from the front edge of the perch over the top of the tube to the rear of the tube weld both ends then were its on the tube.along with the back brace your 83/4 will be race ready I have dun them like this for a 4speed car leaving at 6000 with the wheels in the air.with no trouble..just trying to help......Artie