Looks like the Chevelle core support mounts that I bought back in December for my '68 GTO. Won't work...the GTO stuff is a little different, especially the nuts, which go inside the frame rail. I'm ordering the kit from Ames and will install when I get time in April.
But I could be wrong...just my $.02
'68 GTO, 400/TH400, AC/PS/PB/PW, hideaways, Hurst dual gate
'72 442 'Vert, 350/TH350, AC/PS/PB/PW
'74 Corvette, 383/4-speed, 450 hp, restomod
'71 Javelin, 304/3-speed
'70 Cougar XR7 'Vert, 351W/FMX auto *SOLD*