Advance Plate

I currently have my slots welded up so that my initial is running at 30-32 degrees with total at 36-38. No pinging and this seems to be where it is happiest and idles best. I forget what the slot measurement is but it aint' much! I think I ended up around .330 or .320.
I've got a couple of advance plates I have been experimenting with.

10.5 compression and a 508/292 cam. 4000 stall and 4.56 gears.