Thermoquad help

Welcome aboard!

Use which ever one has the least throttle shaft play and is in the best overall general shape.
should I use the bigger ones? metering rods are 1966 and 2024 - which one is better?
This is generally a impossible question to answer since it is a tuning issue you face and you will have to try them out to see how the engine likes each jet and rod combo.
Better off starting with a (Bigger) richer jet setting than a lean one.

Also, the wording, large cam, leaves a lot to be desired. Knowing the specs really helps. Even more so in questions like this.

Give it a go. Worst case... you purchase /change out the plugs.