Carburetor running too rich

Hello, to all who read my car which is almost ready to drive once my tires get delivered has had a fuel mixture issue since I upgraded the system with this kit:

https://www.summitracing.com/parts/edl-2021?seid=srese1&gclid=Cj0KCQjwka_1BRCPARIsAMlUmErNqWUgv3EXQx4P3E8_JgAcwu06K10q8OjpFKt2IyBwZUkYlgTNp_4aAgdCEALw_wcB

I have put in 3 different sets of idle mixture screws and still no change. I have her idling at 850 890-ish RPM's but cold starts are terrible as I have to hold the pedal to the floor for it to even idle but once it's warmed up it'll sit there and idle with a very very light stumble sometimes. I for the most part have no idea what I'm doing I just twist a screw or adjust timing here or there and hope I'm doing something right.

Now what I have learned about this engine is it appears to be a newer 305 block on 1976 heads that seem decent besides having bad valve stem seals and supposedly it was turned into a 307 I have no idea if this is true though and I don't know if that would result in any kind of a difference.

I have had to adjust timing all the way to picture shown to get it to idle this low right in the middle of that circle piece of the timing bracket piece.

Thank you for any advice given towards this situation and have a good day.

I could record two videos of the cold start and then one of it idling if that'll help with any understanding. Thanks.