OFFY DUAL 1BBL Intake question

So I'm putting this Dual 1bbl intake together for my 66 cuda and the directions say to use jets 2 sizes smaller than stock. Is it even possible to find these any more? What is the consequence of not using the smaller jets?
joe


Hey retired Navy,

Retired army here. Just got mine running today. I don't see anything wrong with running the stock jets given that these motors tend to run on the lean side.