360 does not seem to be making power and is slow in the 1/8. Need help and/or suggestions

Will need a real convertor to run 11’s
I went 11.60’s in a heavy car with stock fuel tank and 5/16 line
The line diameter isnt an issue. Maybe the fuel pump could be, but you can go FAST with 5/16 line.
Making sure the thing isnt breaking up and will pull cleanly to 5500-6000 grand iswhere i would start. If it wont do that, nothing else matters until it will