A 440 A-Body... that can handle?

Getting the weight balance right will be a big deal, get as many aluminum parts as possible. The heads really make a big difference, but if you've already got iron heads set up then you can run with those, just one less thing to save weight on. But yeah, aluminum intake, battery in the truck, mini-starter, every little bit helps.

Before you even do suspension, get the chassis right. Subframe connectors will help a lot, torque boxes too depending on the output on the engine.

Torsion bars should be big- I recommend 1" or larger bars on EVERYTHING, including small block cars. These cars were horribly undersprung from the factory in the front, all across the board, from /6 to the big block cars. I run Just Suspension 1" bars in my Duster right now, and I'm going to be upgrading to 1.06" bars at least. PST sells a nice 1.03" bar that should be just about perfect for the street for most folks, they're a site sponsor too. :D Then a good set of shocks, Bilsteins or Hotchkis' new custom valved Fox shocks would be a great start, but they're spendy. Sway bars, probably about as big as you can get in the front, smaller in the rear. Adjustable rear bars are the way to go, especially if you're running heavier springs in the back. On the 108" wheelbase cars you don't even always need a rear bar depending on the rear spring rates.

Tires are a really big deal too, just going to a modern performance tire will significantly improve handling. Unfortunately that means going up to at least 17" rims, you can't get anything in the way of a good performance tire in 15" anymore (BFG T/A's are not a good handling tire!!!). If you don't have the car already, look for a Duster or Demon. I fit 275's on the back of my Duster with the stock spring locations and without jacking up the rear of the car. I believe that 275's will fit on the front as well with the right backspacing. No big & little look if you want to turn corners, running at least a 245 wide front will really help. 245's should fit pretty easily as well, going 255 or 275 makes the fit pretty darn important.

Brakes are a big deal too, you want to stop all that HP. Still, you can use the later Mopar 11.75" rotors up front with stock calipers and get a good upgrade on braking without going to a Wilwood or other kit up front. I run 11.75" rotors on my Challenger and my Duster, they work great. Way better than drums, and better than the 10.87" stock disks too.