What Carb for Poly Stroker

Bewy said

To remove m/rods: loosen piston cover screws about 2 turns, swivel enough so that piston + spring come out. There is a small spring that hooks the m/rod onto the piston. Do not lose it!
With top back on, gently wiggle the rods until they go into the jets & then tighten the cover screws.

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When you twist the m rod covers out of the way, keep a finger over the piston well to prevet losing a spring. These springs are a tuning component that works against manifold vacuum to adjust when the metering rods come up out of the primary jets to enrichen the mixture for power.
On Holley style carbs you have a range of power valves that give more fuel when manifold vacuum drops below its set point.
For the Carter /Edelbrock carbs you get a few pairs in the calibration kit, or you can order individually. They are color coded so you can determine the "hg they open at like Holley poer valves are stamped with a number.
Obviously a learning curve moving from modular style carbs. Once you get the tuning set it will stay in tune and not leak. If atmospheric conditions change a bunch, just remove the air filter housing and the power piston covers enough to swing asside and lift the piston and metering rod out. Just be careful.to hold a finger over as you swing the cover out of the way. Should only take 2 turns on the screws to let the cover swing out of the way. If you do not remove the screws they can not fall into the manifold.
In the box is an owners manual with a graph for tuning and points are numbered. Then you look to a chart and that will show the jets, metering rods and springs to attain that tune. Once you get it tuned, a metering rod change is probably all that is required.