need help asap what carb for my motor 600 750?? edelbrock

ya but atleast i can tune it mine is blocked out because it was a cali car
i can run the one air fuel mixture screw fulley in and it wont lean out still smells rich
plus i have this issue now of it only wanting to make 1/4 of the power it should and im almost 100 percent sure it comes back to the carb

was just thumbing thru summit and seen they had they thunder series of the edelbroke
but its like 150$ more any one have input on these or im i just better to get a standard one and adjust that up