carb problems

so awile ago i bought a holley 670 street advenger for my truck. well started it up the second time with correct oil pressure this time and it idles fine and i can rev it up to about 2500 or 3000 rpm and then it starts cutting out. i believe that the jets need to be changed but to what. my motor is a 360 punched to a 366, it has about a 503" lift cam, edelbrock rpm air gap intake, and about 9.5 to 1 compression, i dont understand the problem. seems that, that wouldnt be enough fuel for the motor. but we took two of the spark plugs out and all black. so obviously it is running a little rich.

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so awile ago i bought a holley 670 street advenger for my truck. well started it up the second time with correct oil pressure this time and it idles fine and i can rev it up to about 2500 or 3000 rpm and then it starts cutting out. i believe that the jets need to be changed but to what. my motor is a 360 punched to a 366, it has about a 503" lift cam, edelbrock rpm air gap intake, and about 9.5 to 1 compression, i dont understand the problem. seems that, that wouldnt be enough fuel for the motor. but we took two of the spark plugs out and all black. so obviously it is running a little rich.

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Change the plugs and then look at your ignition