I agree with chuckthetruck. It's the same as what I have on mine...except that I run a Carter 625....just cuz I had one. It runs super...starts well and helps cure the monojet cold-bloodedness.

I haven't noticed anything negative from running the larger carb at all. I haven't checked gas mileage but then again with 4.10 gears, I don't expect a lot.

You may have to do some forming and fitting to get the Offy manifold and Hedman Hedders to work together. I did. I had to grind a lotta material off the bottom of the intake and also the "bolt-on" plate near the #1 cylinder. But after a little adjustment here and there it works out pretty good. I sure wouldn't wanna go back to the old carb and exhaust manifold.

Btw, you may wanna consider a Pertonix or HEI to replace the points. But then I'm prejudiced against points. (I'm puttin on my firesuit, just waitin for the flames.)

Ray
Enter the Chevy Asylum
"The Ugly Truck"