Dumping the FBO timing advance plate.

For you math freaks.

Take the plate tower out, measure length of existing slot. Note the degrees on tower. Measure pin on weight.

Subtract pin diameter from slot length. This is the swing. Divide swing by plate degrees= degrees per .***"
Multiply (degrees per) by the number of degrees you want in the distributor (x2 for crank) = slot length

You can check it after altering without having to put everything together. Install tower with advance in place. drop a degree wheel on top of dist. Install rotor and tape a long zip tie to it. Hand twist the rotor and see how many degrees it moves via wheel.

When I do the weld/jb weld deal, I always do the inside. Doing the outer and making the oem start point to new limit, makes things come in faster. I prefer the spring a little more stretched and slower rate (further out for shaft center).