I got two springs for ford but they worked, maybe kind of light also but will do some more test and tune. Now it dont get all mechanical advance directly. Unfortunatly its advance about 30 degrees...

I will modify this part to get the correct mechanical advance. What is this parts name, advance plate?

And mine is marked AC.

Have seen marking on others here on internet as 11R and 15L but that assume is the degreesX2 of mechanical advance but what is the R and L, right and left? If, should R plates be used for smallblock (rotating direction clockwise) distributors and L ones for bigblocks (counter clockwise) dists.

Cheers!