My combo is close yours and I have tried two different sets of carbs on my Weiand-1850(600) and 4224 (660 center squirters). The center squirters are faster and leave harder. I had to lean the idle circuit out on the 4224 but after that it was all good. I noticed all the hard core racers can spot them a mile away. I actually have both sets of carbs for sale if you are interested.
'75 Plymouth Duster
Phase I 451 906/590/2-660 10.75/126
Phase II 451 Stage VI/590/1050 9.82/135
Phase III 383 906/Victor-Pump gas 11.30/119
"For by grace you have been saved through faith. And this is not your own doing; it is the gift of God,"
| 
