I'm running a 5.9 Magnum in my car as well. Granted it's not an A body, but still. The engine is a bone stock rotating assembly with stock (and possibly cracked) Magnum heads.
Comp cam (P# 20-746-9) - 216/224, .506/.506, 114 (spec'd for turbo application)
MP springs and retainers
Edelbrock Air-Gap with 1/2" open spacer
Quick Fuel 650 dp (Also tried an Edelbrock 750, but the 650 was better overall)
Summit block hugger headers (1 5/8" primaries, 2 1/2" collector), dual 2.5" with x pipe
LA front cover, water pump, with v-belt drive (custom brackets to run stock Denso alternator)
The car weighs roughly 3000 lbs with me in it. Heavier than most people think, but I haven't tried to lighten it up any, yet.