Cam Upgrade for my 408. Need some advice.

Being that it was dyno'd with small tube headers and an airgap and now has 1-5/8 to 1-7/8 step headers and a Super Victor, the additional 15 degrees intake and 19 degrees exhaust @.050 would be a step in the right direction. It's near to the largest cam I'd try with the 11 inch lock up converter (stall not mentioned) and 3.55 gears. Another option, depending on core availability and piston to valve clearance.
CE6K 245/255 DUR@.050, 585/600, 106LC, 2500-6800
Their tech support recommend these springs for street use with their smaller roller cams.
HERS580K 1.550 Valvespring / Moly Retainer Combo- S580K
The EdelBrock ProFlo may not play too well with the 106 LSA, but they're ground on a custom basis with an open LSA option. I would be inclined to talk to E-Brock Tech Support about how little vacuum I could reasonably get by with on the system before setting the LSA.