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my ? is when i am in nuetral and let the motor idle it seems to be alright. from an idle eaze into gas its alright. but when i gas it hard it runs rich. Would that be to big of a squirter? when i start to crack open the secondaries as i am driving it goes lean this for sure cause the colder it gets the worse it gets. My ? is primary squirters or jets foar my rich condition. its a 750 mighty demon on a 406. oh when it starts to go lean when i start to crack open the sec. if i gas it it goes away
Without knowing anymore information than what's already posted and assuming this application is properly set-up with rear-end gear and transmission stall...
28 to 31 squirter with a 30cc pump on the primary (pink cam quite possibly the black version to cut it down by 20%)
31 to 35 squirter with 50cc pump on the secondary (brown cam)
...or three... ditch the Demon for an HP Holley:D
Again I know nothing about your application but with a 750 carb and a 408SBC that's the range you'll see. Also consider timing curves, fuel pressure, float settings, and engine temps.
There is soo much to tuning but I believe that will get ya in the right direction.
~Ty @TLI/TPC