When you are accelerating, does the engine lose power like you are running out of gas? you can check the pump pressure and volume to confirm any issue there. Small block Chevy standard pump should be somewhere in the 5.5 - 7.5 psi range, volume probably a pint in 30 seconds of idling?
1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
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