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

dont want a holley want the eddy i was just asking about the thunder series just because i seen them in there i actually just picked up a carb from a buddy he took it off his car and went tunnel ram its a 750 eddy but for the price of the parts i gave him that were extras that i needed to move so really free will see how it works
i can alll ways sell it and get a 600 but if i can get it where it needs to be ill run it
any one have any insight on what i may need to do for jettting and such or should i just throw it on and try to get a base tune if i even can sense its a 750

i was all was told ya its a 750 but at idel and not into the secondary's its just as tame as 500cfm not sure if that tru or not