I swapped to a 350 with a Quadrajet also and initially used the V-8 bracket but didn't like how close it came to the HEI distributor wires. I put in a later 71/72 throttle pedal with a cable setup. There are a couple of "how to's" around here somewhere. It took a little effort but the result is a smooth pedal, full throttle and no worries about the lever & rod hitting wires. The downside is the pedal does not look stock - short pedal that doesn't hit the floor.
Here is the write-up I followed - around post 110:
http://67-72chevytrucks.com/vboard/s...le#post5286113