I installed a new Holley Street Avenger 670 carburetor and was surprisingly able to start up the car immediately. The idle was decent and the air fuel mixture wasn't bad. Without any tuning, I decided to drive it around the block just to see what it was like out of the box. I didn't have any trouble but watching the AFR gauge, I could tell a little tuning was needed to get it to run good.
I decided to go ahead and start tuning straight away and went with the float level first. As a starting point, the front bowl level was about the middle of the view window. I drained a little out of the bowl using one of the four bolts which hold the bowl in place. I loosened the set screw and turned the nut for the needle and seat a half turn clockwise. When I turned on the key, the electric fuel pump filled it right to the bottom of the sight window. Done.
The rear fuel bowl was about 3/4 of the way up the sight window before any adjustment. This one took two adjustments to get set to match the front bowl level. The first adjustment was a 3/4 turn clockwise followed by another 1/2 turn clockwise. It was then in good shape.
At idle, the car was at 13.5:1 so I thought I'd check the idle mixture screws. I turned them in to see how far they were unscrewed and found they were only screwed out 1/8 to 1/4 turn each. I just set them back as they were originally and left them alone.
When driving, the AFR was about 14:1 which isn't bad. When I really get on it, it seems to need a little more accelerator pump but I'll wait to change that. However, I'll wait on that as there are other things more important and I'd like to work through this in a good order.
Stock Configuration of 670:
Front Jet: 65
Rear Jet: 68
Pump Nozzle: .031
Pump Nozzle: .031
