How to check timing on a /6 with engine in car. Options

[tornik550]

How do I check timing with a timing light on a /6. I know how to set the static timing however I want to check with a light. I have seen that some cut an acess panel in the firewall. I don't want to do that at this point. There isn't enough room to fit a timing light.

[sixnotfour]

OTTO says....
Take dist cap off, stick car in fifth gear with brake off, push car foward until rotor points at knotch in dist housing. Verify this by using a mirror to verify that the knotch on the fan belt pulley that has Z-1 on it is straight up. With the rotor facing toward the notch in the dist housing, Z-1 straight up(lining up with where the two case halves meet)use FBI paint, nail polish, whatever to mark the flywheel straight up. Then push the car 325 degrees and the front pulley will come up on the 35 degree mark. Use some other color paint to mark the 35 degree mark on the flywheel. Then push the car foward 5 degrees further so you can identify the 30 degree mark. Use some other color to mark the 30 degree mark. Do not push car backwards, it puts too much load on the chain tensioners and they might colapse. With the dwell set @ 38 degrees +/- 3 degrees now you can check the timing with a timing light. With these three marks on the flywheel, you can also check if the advance in your dist is working. At idle the timing should be 0 degrees, or where you marked Z-1. Above 3000 rpm it should hit 20/25 degrees, at 6K it should be somewhere between the other two marks you made. If this breaks your brainm like it did to write this, call me and it will be eaiser to explain over the phone.