Hi,
First you got some good stuff going, it's shame to waste it's effectiveness.
I think the first thing you should do is rent or purchase an engine vac gauge and get the basic readings and tune the carb. Note all of your engine's baseline data. Include a graph of your dizzy's advance rate in 500 R increments to approximately 3K.
Next, definitely add the 02 sensor(s) bung(s) in the collector, adding to both sides while you're at it. After which, I would seriously consider scheduling a few sessions on a chassis dyno. You will learn a lot about what you're AFR is doing from about 2500 to 6500 Rs. It is well worth the $150, or so $s. If no convenient Dyno shops around, then purchase a "quality" wide band AFR testing kit and have at it. The data logging feature will allow you to get on the road readings that can be reviewed on a laptop later. But, most good kits will cost about $300. The other thought, (less expensive) is Innovate makes a dash mounted wide-band gauge that connects to a sensor bung, that will provide "real-time" AFR readings.
I have an Innovate set-up that I started using prior to doing attending 3-4 Dyno sessions. The sessions will show where you're AFR is lean or fat, or, if the carb is just too big to jet down. It would be good to get a 14"ish AFR idle reading with with a fairly flat line 12-9-13-3 AFR, or s,o at WOT or 6000-6500, what ever your engine's red-line.
Another system to fine tune is your dizzy curve and the vac unit. If this is a street warrior, there is no shame in running a dizzy vac. However, the engine may "like" one port over the other.
My engine responds best to full vac. I 'm running 16 deg initial, about 4 deg dizzy vac, with "all in" at 3100 Rs.
As a comparison, my 333, running 170 TWs (w/little port work), Performer RPM, 680 custom tuned Holly XE, TRY-Ys, CI hydraulic roller, custom curved dizzy powered by a Jacobs sparkie box. My rig was dynoed at 392 RWHP at 5900 with 400 RWTQ at 4400.
I fined tuned all of the major players to insure I left no, or very little, HP/TQ on the table. In the end, maybe I did, as I forgot to remove the
K&N air cleaner before making the runs.
I hope some of this helps!
Good Luck!