Best cam choice?

I'd change the springs with any new cam. It's a cheap spend.
Heres something that'll pop right in and do well with stock heads, gear ratio and converter. Not to big of a cam.
http://www.cranecams.com/?show=brow...-440 C.I.&partNumber=643801&partType=camshaft
OR, something a lil'more aggressive;
http://www.cranecams.com/?show=brow...-440 C.I.&partNumber=684561&partType=camshaft
But this WILL need springs and some work to really get her going.