Tuning issues.. Jake can you advise?, advance curve or jetting (that is the question) Options

[brant]

I finally got my latest project running but not well enough
I need to do a little tuning...

its a 1.7 motor with a cam (don't know the specs of the cam) from the previous owner
I can get leak down/compression, but don't have them at this moment.
I also don't know the compression, but it is mild... probably stock

the P.O. claims it was rebuilt and I believe it
I took all of the tin/push rod tubes off, and it looks to have been rebuilt with out worn/shot stock cam lobes and with lifters showing no significant wear
doesn't seem to burn-smoke or leak any oil at this point.

Its running 40mm dual webers, currently testing at 3300 foot altitude
(motor came from a running car at about 5500 ft)

I rebuilt the carbs and the jetting is:
-28mm (chokes) main venturis
-2ndary venturis 4.5
-main jets 115
-air jets 200
-emulsions F11
-acc. pump ball jet 50
-acc. pump towers 50
-idles 50
I've never carbed a 1.7 before

The motor came with a 009 distributor and points
I ditched it and put in a L-jet 914 (1.8) distributor with points, blue coil, and no retard/advance lines hooked up
the cap/rotor/plugs/wires are all good-new

car idles smooth, pulls fine from standing, and then stumbles mildly from 2000 - 3000
the car clears out and runs great at 3000 or 3100rpm
timing is currently set at 29degree's, but this is my norm for altitude.

dad and I are in disagreement about the cause
he thinks its too rich for the tiny motor

I think its a distributor curve issue

Jake, do you know?
I have a Djet distributor available easily... or could put the 009 back on... or think maybe I should buy an 050 somewhere to see if the curve is actually the problem

We discussed buying 110 mains also to play with it...

thanks in advance for any advice from the guru's out there
brant