You need the "standard" 440 adjustable bracket. The Indy/Victor one would be too tall for your intake. Since your throttle cable is too short, I'm going guess you replaced the stock slant 6 one with a V-8 version . The easiest thing to ask for at the parts store would be... a throttle cable for a 1975 slant six Duster. If there is a Carquest near by, they carry the Pioneer line of cables. Take a look at the firewall where the cables goes through. Some cars have a round hole others have a square hole in the firewall. The Pioneer part number for a 23.3 inch long cable with a square fitting is CA-8411, a 25.8" cable is CA-8413. For a 24" cable with a round fitting the number is CA-8418. You can also order the cables from www.partsamerica.com This was in the tech archives.... I have a dommy on a 2" spacer on an M-1 intake and used the Pioneer 24" cable. Had a slant six cable and it was a couple inches short. I hope this helps!