1976 Oldsmobile Cutlass Wont start, cranks 1 out of 5 tries

I just recently added new pulleys belts new valve covers new edelbrock carb, mallory daul point distributer, msd 6420 ignition, blater 2 coil, msd 8.5 mm wires, accel shorty spark plugs, new electronic fuel pump, electric fan, battery and starter. The car ran befor i just wanted to dress it up. After i finished intalling it all i went to go start it i got a crank it rolled over but didnt start. i went to go double check everything; timing, top dead ect, went to go start it and and nothing just a load thud, not the noise you here when the battery is low but 1 thud then a little whining noise. over and over the same thing then randomly out of no were the motor will crank and roll over then come to a sudden stop. and nothing after that just the thud and whining noise. PLEASE PLEASE PLEAESE HELP IM SO FRUSTRATED