Is anyone running a 4425S Carter on a 68 340 engine?

All 1968 AVS’s have one screw and lead capped base plate screws. Sometimes you can pull the caps off and adjust the screws. I couldn’t with mine.

1968 engines with AVS’s on 340, 383, and 440 had them. 1969, 1970, and 1971 AVS’s have two exposed adjuster needles in the baseplate.

I had a 4425 on my 1968 340 in my barracuda. Changed to a 1850 Holley 600 cfm vacuum secondary. Not a big difference. Not that an 1850 is anything real special.