Those look great are they installed from bottom ?
Yes, after you remove torsion bars, steering column, steering linkage, clutch linkage and, in my case, the steering gear box. Then they just slip in. Trick is getting everything you took out back in. I discuss it all at more length here:
early A-BODY 1-5/8" x 1-3/4" SMALL BLOCK STEP HEADERS
Post #22