Issues with a rebuilt 360

This is the secondary(rear)metering block...... no power valve.
That is the std Speed Demon emulsion pack in the block.
It generally works just fine if the air bleed sizing is correct(which is often not the case for the “bigger cam” combos).

The bowls should be installed so the fuel inlets are on the passenger side.
Iirc, there is a “P” and an “S” cast into them somewhere, although I don’t remember if they all had that.

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Edit...... I see what look like swirl marks from an abrasive “cookie” being used on the metering block.
Hopefully if that was done, it was done with extreme caution.
Abarasive materials and carburetors are generally not a good match.