The only thing that happened really up top on the subframes in 73 up was the moving of the fuel line to the Pass side, and it then crossed under front of oil pan. 70-72 the fuel line crossed the main support and ran up drivers side to fuel pump.
Doing this cut some costs and made them "almost" a equal swap to a camaro..
Alex's Subframe is a very very nice piece. Have seen it in person. While it is a 1 year only frame ( due to support gusset under side) It will work fine for 70-74.
Buy your LOWER control arm bushings for the FRAME year you use. 1970-Dec 72 used a small bolt and bushing center. Later in 73 they went with a bigger bolt and continued this for the whole rest of second gen.
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