main jets for a rochester 2bbl

does any one know where I can find out what size main jets i should have in my carb. at 3000 ft.

 

production (factory) .051
over 5000 ft .049
over 10000 ft .047

 

OK, not to hi-jack, but where can I get jets for a 2 barrel ? I'm at 6000 feet (give or take).

Thanks

 

they are rather hard to come by
Holley jets are not interchangable
I you stay mostly at 6000 ft., I would just kick the timing up 2-4*; that should help a bunch

 

thanks a lot that is exactly what i have in it now, good to know.

 

I found 49's (it had 51's in it) at a local carb rebuild place - I put them in tonight. Idle mixture screws needed adjusting, then I took it for a 20 mile freeway run... I didn't notice a difference in performance, but my plugs showed it is running where it should be. Maybe now I'll get better than 10mpg ?