86 TPI Z28, was originally 305 now a 350 swapped before I owned it. Getting ALDL codes 32 (EGR Circuit), 33 (MAP sensor signal), 36 (Ignition fault) - is there a common denominator here that I should be looking at?

Car is running, driveable, etc. Electrical is a bit of a mess, prior owner just hacked stuff out.

Maf 36 is burn off circuit failure. 32 is more than likely the egr temp sensor issue. You might have it programmed out and maybe even the 36 when you do a 350 calibration tune. I would focus on the code 33 maf high. Got a aldl to usb cable to monitor grams per second at idle up to 1/4 throttle?

What brand maf are you using?

I do not have an ALDL cable. And I would like to tune this engine but TPI (and fuelies in general) is new to me, but I can figure it out - Any recommendations on a kit with software to start?

Moates.net has a xtreme aldl cable. You can use this with tunerpro rt.
The mask for 86 is $32 . If it doesn’t work concerting from ads to adx to use with tp let me know and I’ll post it in adx. it might be difficult to connect to and seems like converting to 89 $6e mask helps once you’re tune is changed. There is always winaldl easier to connect to and see live data but kinda hard to read.
Btw what are the letters off your memcal chip ?