[PiperDavid14]

how can you tell witch jet it right for your engine?

 

[C-10]

Read the plugs.

 

[barnym17]

At the strip go up till mph falls then go lean till it begins to fall again back up one step and you got it.On the street start at stock settings, then lean 2 sizes check plugs,I keep leaning till I get a lean surge then fatten up till surge is gone plus 1# on jet size for best economy.

 

[techinspector1]

If you have a Carter AFB or Edelbrock, here's the Owner's Manual that may help you dial it in....
http://www.edelbrock.com/automotive_new/mc/carbs_acc/pdf/carb_owners_manual.pdf