Wow Bob. So sorry, I typed a response Sunday to you but didn't finalize sending it. Ughhhhhh!
Main reasons for me are...
Longer cable
More positive retention at the carb bracket (which will need to be replaced also) as compared to the stock rubber slip on design
More positive retention at the carb. (Need to change from stock ball style to stud style.)
With the stock style cable, in some situations/set ups it is too short. The longer cable let's you use just about any set up. (Intake/spacer combo)
Plus, it's new. Lol
Photo-
1- comparison of new cable (top) to old (bottom) lengths.
2- cable retention at carburetor bracket
3- cable retention at the carburetor
4- the part that goes through the firewall to gas pedal
5- the 2 "things" that need to be trimmed, filed, grinded, cut from both sides of the g-body cable for it to lock into the firewall.
6- after modification
Before installing the cable through the firewall, slice/cut the white bushing from the gas pedal side and remove from the cable. After installing the cable to the firewall, pull the cable through the hole in the gas pedal bracket and reinstall the previously removed bushing. Then snap the bushing into the gas pedal bracket.
7- new cable installed and secured.
All fluids done, gauges installed MSD installsed. Just got delivery of the fuel fittings and lines. Probably tomorrow's project and then fire up! Lol