Re: 67 rs grill or 68
If you went vacuum, you'd need to drill the 1" hole through the firewall for the vacuum lines to the headlight switch, plus add lines, reservior, check valves, relocate the windshield washer fluid reservoir. The vacuum system also has it's own issues. Ask any of the 68 and 69 guys who are converting to electric...
The original 67 RS motors had issues, but I think the modern ones are much improved. I would think that the modern setup that guys are retrofitting to 68 and 69 cars would fit a 67, as long as you had the right bellcrank setup.
69 'vert project big block/TKO 600 RR
68 'vert driver RS clone -- gone!