Do you want clean plugs for this ?
No.
I also had to change it a little . Below is the new one.
This is the first step . Post the results and video and I can make a plan for the next step right away.
The basic goal is to advance the timing and see if the rpm increases . If it does and the engine still runs smooth, you will get a little more power and better throttle response with more advance.
1. Rotate crank until you see the engraved top dead center line . This will be between the two 10 degree marks . Put a white line on it and write 40 to the right of it as you face the engine.
2. Loosen the distributor bolt around 1/8th turn.
3. Start engine and verify that it is still on the white line on the 282 mark [22 degrees btdc].
4. Locate the new 40 mark without turning the distributor and note where it is.
5. Advance the timing slightly and listen for a change in rpm or rough running or popping sounds . Don't rotate it quite as far as half the distance between the distributor cap posts like we were doing because this will be WAY too far . The most you want to go is around 1/8 the distance between the post or around 4 degrees on the crank which will be two lines.
6. Retard timing to the 282 mark.
7. Hold rpm at around 2000 to 2500 rpm or 1/3rd throttle and advance the timing a little like you did in step 5 and listen for a change in rpm or rough running or popping sounds.
8. If the rpm increases and it still runs smoothly, try to see what mark it is on or where the new 40 mark is in relation to the timing pointer.
9. Let it idle and tell me what mark it is on.