FBO Curve And Limiter Kit

I'm using one in my slant six. It runs a lot better with about 13* initial, and I think I've limited it to 31 total with stock springs. I'm running a stock emissions vacuum canister with something like 16* of advance, so I don't want a quick curve since I already get a touch of part throttle ping on really hot days in certain conditions. Not to mention, it's a slow car already, so I didn't feel the need to limit my vacuum canister to get a little quicker curve...man, why am I rambling?

I have used one and it seems to work and I like it. :)