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I have a timing light, now how do i set my timing. My car is a 89 Colt Turbo with a 91 4g63T engine.

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Robin Hewes
1989 Dodge Colt 200 Turbo (4G63T)
1990 Dodge Colt 200e (winter beater)
http://www.nacdsm.org/gallery/Robins-Pics

OK stand in front of your car with the hood open and car not running. Now look to the firewall you should see a funny looking plug all by itself, some call it a test plug. It only has one wire running to it. You need to ground out that plug with a paper clip, running it from one side of the plug to the next. Now you can alter the timing without the computer pulling it back to zero.
Now hook up your spark plug sensor wire from the timing gun to any spark plug wire, dial in the timing gun for a 4 cylinder car and rpms.
Start the car.
Aim timing gun at the pulley timing marks. You should be able to see the timing mark on the pulley now lining up to the timing marks on the engine front cover.
***If the timing mark on the pulley is jumping then you have a bad crank pulley, and need a new one before you can time the motor.
Now if you have a clear reading of the timing mark on the pulley, go to the camshaft sensor and lossen both nuts. This will allow you to adjust the timing, IE advance or retard, by turning it left or right. Moving the sensor towards the radiator will cause the timing to advance. Turning it towards the firewall will cause the timing to retard.
The motor will run well at 12 degrees advanced.

Once you have the timing set tighten down the nuts to the camshaft sensor. Remove the paper clip. Remove timing gun connections, shut hood and drive!

Please understand that this timing has nothing to do with dialing in your cams, in order to tune cams you need adjustable cam sprockets. That is a totally different subject all together.

What is recommended base timing for a '61t with a few mods?

between 10 and 12

WHAT?? 10-12 degs base timing!?!
Factory spec is 5 +-2 degs. You shoud not advance it to more than 8-10 degs IMO.
Else the ECU may not retard timing enough in the event of knock.

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Got rabies?

Not talking NA, talking Turbo cars.

??? Me too. I wouldn't personally advance timing to 10 degs. It's way too risky. OTOH, if you're running all day on race gas, this probably isn't as bad. Nonetheless, I'd stick to 8-9 degs.

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Got rabies?

With boost higher than stock, always use 5 degrees as base timming.
Did several tests with logger, 94 octane gas on my 4g61t and anything higher than 5 degrees gives me sever knock at high boost 18-19psi.