Distributor curve help needed
If its an automatic, you can experiment by checking for most power (least drop in rpm and vacuum) with placed in drive at idle.
But within 50 to 100 rpms above idle rpm, the timing should advance.
Take a look at the factory timing specs to get an idea of how quickly timing is added above idle rpm.
That was true even with non-performance cams (with less overlap and better compression at low rpm)
You might be able to drop it to 16 or less at idle. My concern was how it was going to respond when you drove it.
If its an automatic, you can experiment by checking for most power (least drop in rpm and vacuum) with placed in drive at idle.
But within 50 to 100 rpms above idle rpm, the timing should advance.
Take a look at the factory timing specs to get an idea of how quickly timing is added above idle rpm.
That was true even with non-performance cams (with less overlap and better compression at low rpm)