Help with cam choice for magnum 360 please

octanejunkie said
On a Chevy board I was looking for springs for a vortec application, these were suggested as comp beehive-alternative springs, GM PN 12499224
- 90 lbs. @ 1.8 in.
- 295 lbs @ 1.250 in.,
- .570 in. Maximum Lift,
- LS6/LS2, Set of 16
- Outside Diameter of Outer Spring (in)1.290 in.
- Coil Bind Height (in)1.085 in.
- Damper Spring Included No
- Spring Rate (lbs/in)375 lbs./in.
- Valve Spring Style Standard

Summit Sells them for $68 http://www.summitracing.com/parts/NAL-12499224/

Scoggin-Dickey has them for $57 http://sdparts.com/details/gm-performance-parts/12499224

You need to talk to the machinist about your heads and where they are now, cause 1.80 installed height is gonna take some work=pop up retainers/cut down spring pad/sunk valves ...to get from 1.62 or whatever they are now , to 1.80. also 97 lbs sounds a lil weak for seat psi, even on a hyd roller.
The rate isn't bad though, maybe put them in at a more obtainable and better seat psi @ 1.75 or less.
And you should look at the psi per increase in lift between the 2 springs, one might pick up 30 psi per .100 while the other is more or less, you need to have just enough psi to control the valve/lifter and no more, otherwise you're just eating up power and xcellerating the lobe wear for no reason.

just off the top of my head...