pulled the horn off, pulled the jets the needles slide into, and the jets have no numbers on them. Am I stupid? I remember carb jets having the sizes stamped on them. This is a rebuilt carb out of Fl. I want better fuel economy, it is going on a 360 fe block, very stock, still has single exhaust, for now. Any help out there deciding which jets to put in? I was just going to get the smallest available, any drawbacks to this? Thank you

the intake is an edelbrock 390 performer, NOT RPM.