I installed the ECE sway bar on my '72 with no drilling required since the sway bar was optional equip. Don't know if the '67 has the drilled lower control arms or not. When installing the bushing brackets on the frame, it is necessary to cut and punch out a rivet on the front cross member.
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'72 GMC SWB C1500 Custom, frame-off in progress. 383 SBC, 9:1CR, Comp Cams XE262H, Scat internal balanced crank, Eagle SIR 6" rods, Keith Black dish pistons, Dart Iron Eagle 72/180 heads, Weiand Stealth intake, Stewart stage I water pump, Holley 4bbl vac sec, TH350 with B&M Shift Improver Kit. 12 bolt positraction.  
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