that cam is pretty choppy at idle in 454, but more cubes will help. in my 68 I tried the 280,292, and the 305 none of which i would use again, keep in mind this was almost 15 years ago and cam grinds have advanced alot since then. in the end i think you will need something with a 112+ to make FI work good because the vacuum will fluctuate too much at idle.