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How much power will the stock 351 EFI intake support?

Is the stock EFI intake restriction mostly the lower or upper or both?

Would a Lightning lower with the stock 351 upper intake flow better than
the stock combo? How much power do you think this would support?

Also would like to know how much power the stock fuel system can support.
Stock pumps, stock lines, stock pressure, but bigger injectors. At what
power level do you need to use bigger fuel pumps and higher fuel pressures?

(The added power would come from better heads, possibly a stroked crank,
headers, bigger throttle body and mass air, bigger injectors, etc. Planning
to rebuild my 89 351).
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