Chiphead has good info.
Took 2 hrs on a supposed expert Holley guy set up a 850 for a buddy's 455 with 230/240 something cam with torque 2 intake.
Everything wrong.
Fuel level in bowls 3/4" high.
Pump levers set over tight fuel leak at idle.
Primaries open above idle slots.
Needed 5 jets lower both bowls.
Same guy told him 28* max timing.
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