9379 is a 750. I have one that's been on all kinds of engines over the years. Right now its on a mild small block ford. Killer carb. Very responsive. Annular boosters have their place
I had great success with a 750 on a mild 318. The one I used had annular boosters so I'm not sure if the same tune would apply. I tryed all kind of jets and squirters and found it ran best basically the way it came out of the box.
Look on the driver side of the float bowl. Should be number in a circle. These are the published flow rates.
bore size=cfm
.98 = 190
1.01 = 240
1.02 = 245
1.08 = 287
1.14 = 300
1.21 = 351
1.23 = 356
1.33 = 424
Dang it Dan beat me to it.
With the combo you have I vote Holley. If you get a good one there is no shortage of ways to dial it in, and a healthy 318 will eat the 670 up and want more.