Car 1991 RS 305 TBI
Mods are Performer TBI manifold, MSD 8.5s, ACDelco short plats, Mobil 1 10/30 full synthetic, K&N filter with a removed headlight for air flow, and half a 2.5 inch exhaust to a Flowmaster catback.

What timing is best for my engine and her setup? What am I looking for? How do I know that this is the peak of what it gives out? I really don't know besides guessing on the advance.

I recently have been adjusting my ignition timing and I got it down right at its best(don't remember what the advance was) but I snapped a bolt on my intake and reset everything for the fourth time. In doing so I think I may have put the dizzy right on the money. Did 8° before TDC set at 5o'clock for cylinder one all that. Started right up no problems. So now I'm redoing my timing and it's at 8° advance but still not where it was before. I did notice that did advance way to much and had it at 12° car was fine. But I feel like I shouldn't do it because I can, unless that's what I'm supposed to do?
If it means anything I use a GPS acceleration app on my phone to track my 0-60s I don't take it seriously because of delays and all that but premods(intake) I pulled a 8.1 with the mods plus good timing advance I pushed a 6.7 so I know I did something right.

Update
Last night at work decided to work on my cars timing bumped it up 2° to 10° of a advance and it's running like a champ but I'm gonna tone it down I don't think I need my car running this responsive no one races me or anything so I think it's overkill. But might keep it burnouts and fishtails are quite fun to do on demand.

 

First off, you're choking the hell out of the motor with stock manifolds and a 2.5 exhaust. You'll see much better gains with a header back, 3 inch MANDREL BENT cat back. I vote for Hooker 2460s with a modified Doug's D901 y pipe. Works like a champ. Secondly, you're not going to see a big jump by just bumping up the timing. Just leave it at 8° advanced. If you want a touch more kick, just and adjustable fuel pressure regulator and kick up the fuel a few psi. For a mild stock motor that will work ok.

 

Oh I failed to mention I have a set of Edelbrock shorty headers but they got that stupid smog legal crap on them which is fine if I was keeping my cat. So I might sell them only thing stopping me from installing is the y pipe I didn't know how much it cost at a exhaust shop or if it be cheaper for me to install myself. Tomorrow I'm also heading to my local junk yard to take a LT1 cam off a Firebird or a Z28. I got alot more crap sitting around like a 3.73 posi off a LS1 Camaro and a 91 LO5(complete engine with TBI) that I wanted to rebuild into a stroker but I'm leaning towards a 454 TBI swap instead.
Edit: Not a LO5 it's 5.7 TBI off a truck. Blown head gasket. Maybe haven't taken it apart.