What real difference does the lsa on a cam make?

I install a Crower 34116.114 lobe center,224@ .050'.491 lift, single pattern.Mine idles @ 800,with 21" of vacuum.(5.9).Sounds like a stock 340 cam.You will have your slight idle.The trick is pop for the hughes retainer/spring combo(150,yes pricey).Stock Magnum heads peak .475 to. 490 lift.I spent 299+ tax,if you order online,free shipping.Good luck,love the wagon.