Join Date: Nov 2014
Location: Marshfield, MA, USA
I agree with Woodchuck. I had to replace one of mine. Got a grade 8, 3/16 bolt, washer and lock washer at the hardware store. Way I figured it, if 3 of the 4 are OK and holding the plate where it belongs, the 4th, as long as it's strong and tight enough, should hold things together. Mine has been installed this way since 2016. No issues.
69 Convertible, 351W, T5, E-Brock Performer 351-W intake, Performer Plus cam, Holley 4160, power assist, dual exhaust, 4-wheel manual drums.