Generally, too much advance makes the car run better, but potentially leads to burned pistons & valves. I don't know whether your 1990 has a knock sensor to protect against that.

You say it's a close fit, but I'm talking about rotating the distributor. Each of the mounting tabs (where the bolts fit) are slotted. Loosen the bolts & you can spin the distributor back & forth a bit. That's the range of adjustment - working within that range you still should adjust it properly to the exact position.