What valve springs should I use?

Update on this engine. It rocks! Does not seem to like more than 33 degees btdc total timing. Tried vacuum advance, hates it, I even welded a washer on my vacuum advance pod to limit travel, still no likey. I put 2 factory light springs in a distributor that I welded the slots to limit mechanical advance. So my magnum headed 360 with this mild cam likes 15 initial with 18 mechanical advance for 33 total. Really motivates my Dart Sport. Pulls righ off idle, has an awesome midrange, and seems to not want to stop pulling even at 5500 with this 216 duration cam. Idle is rather smooth, kinda sounds like a factory big block.