I need to learn a lot on checking and adjusting the carb.
I can use a timing light, but am not familiar with tuning with timing.
What are blow back indications?
What do you mean by temps, related to timing?
Actually, the carb is first inspected for full opening at pedal WOT, float level and fuel pressure. Adjusting the carb begins fairly easy by leaning the jets a couple steps. Then you need to adjust your secondary vacuum opening using Holley guidelines. Check results on the next pull. At least you will be closer and ready for dyno "tweaking". Cruise, power valve, idle and accel pump adjustments can be done on the road later.
Ignition timing will begin with WOT or "all-in" timing. If this was not tested on the dyno, then you can either wait for your next session, or get it close on the street first. Normally, this is done on the dyno or track where power or best MPH indicates best timing. If on the street, a data logger or video is often used to get accurate acceleration times from __ MPH to __ MPH or __ RPM to __ RPM.
Set your timing a bit low - say 30 degrees total. Get on the highway, and (safely) decel to the bottom of a gear that will let you accel in that gear to redline without blasting past the speed limit. Usually 2nd gear. Do a run through the gear and note time. Repeat to check consistency. Pull over and bump the timing 4 degrees and do it again. When the runs show no improvement, back-off 2 and test. If no change, back-off another 2 and test. You should end-up where you have best accel times with minimum timing.
Blow-by indications are simply looking for signs of excess blow-by out your breather or oil dipstick tube. Assuming it was broken-in properly, this signifies poor ring sealing, ring damage, or other issue. Not only can this lose power, but worse, it allows oil into the chambers which causes detonation much sooner under load. This can be a limitation to tuning, though a much larger concern with boost or nitrous.
The spark plug temperatures (plug reading) are an indicator of tuning and what the engine wants. No matter what you think it should be, the engine leaves signs whether it is happy or not. Plug temperature (the electrode for timing and the base of the insulator for fuel) tell you if you are giving the engine what it wants. The plugs will show the conditions it was shut-off at, so if testing WOT, then do a shutdown from WOT without idling or driving at other throttle settings. Plug reading is usually done along with the timing runs.
It seems a lot to take-in, but learn and do one task at a time, and you'll get the hang of it. The dyno guys should be familiar with all of this and more. They should be able to answer your questions as you go. While dyno time and tuning time are charged separately, if doing your own tuning, the operator will usually be helpful if you are doing the work.