Suggestion?

It's definitely a Frankenstein, but it started life out as a 4150 390DP. You can see how small the venturii are. That's a 390. I'd lose it for something else.
I was thinking a modified 390 DP but wasn't sure. I don't know if I would just dump it, as it is on the engine and running. I would give it a try in the car and see how it works, If it leaves something to be desired, I would probably try a 390 vacumm sec, or maybe a 500 eldelbrock (I have never used one of those but hear good reports).