Weber Downdraft jet sizes

[Mymgmidget@aol.com]

I have a 1500 with the following mods

Bored .40 over
9:1 Pistons
New valves/springs etc
Mildly Ported/polished head
Headers
1/4 cam
Weber Downdraft (if I only knew, I would have bought a sidedraft)

What size jets should I be using other than the stock setup ?? 
 (put it on right out of the box)  What sizes does anyone else run wth ???

Thanks,
Mike