I am looking for a recommendations for rebuilding the 440 in my Challenger. This is a 70 440 HP2 block with the heavy 6 pack rods and cast pistons . It looks like the block will clean up at .30 over. I will be reusing the 906 heads, stamped rockers, and cast 4V intake, AVS carb. as well as the cast exhaust manifolds. Any thoughts on piston, cam, lifter combos would be appreciated. I want this motor to run on premium pump gas and have good vacume with good street manners. This is a show car, used for short trips , cruising . Thanks everyone for the advice. I will start looking for parts.

About a year ago I went through the same thing on my 70 Cuda.

I went pretty tame on mine and it still Dyno'd around 390 HP.
https://www.youtube.com/watch?v=jQzcBniEGkA

Probe Pistons +12
Comp Cams .462/.470 lift with 110 lobe separation and hydraulic lifters
Compression came out to about 9.1:1 if I remember correctly.
Eddie 750 Carb

The only thing "special" we did was open up the stock heads using the Mopar porting templates. I also chose the Edelbrock Performer intake since its lighter and flows a little better.

Very reliable, good manners, smooth and easy to tune.

I'd move this post to the Racing/Engine Tech forum if I were you. You'll get great advice. You might answer these questions in your post too.
Compression ratio?
Size valves/head work you're doing?
HP exhaust manifolds or log type?
Rear gear ratio?
Do you want a cam with a little lope to it or relatively stock at idle?

The guys on this site really helped me on my engine and I learned a ton, albeit mine is a little more aggressive build.

If you're not married to the 906's, heads like the Stealth or the Edelbrock Performers are a good upgrade. You will spend at least as much to rebuild your 906's as you will to just purchase aftermarket aluminum and be done with it!

Any hydraulic cam similar to the .484 MP cam or smaller will retain drivability and give you a little more punch.

Use your stock intake in conjuction with these mods and (with the stealth heads) it will look stock from the outside.

How much do you want to spend and what do you want to do with it? Any piston with a 2.05-2.06 compression height will do well. As for cam if you don't care and want a street engine I'd run Bob Ks grind and have a little bowl work done on the heads.

I run Wiseco Pro Tru forged pistons and scat H beams. These would put you around 9.3 with a standard Fel Pro .039 gasket, and around 9.75 with a steel shim gasket with an 88 CC combustion chamber (stock 906) once they square your decks. Pistons are around 5-6 bills with a ring kit and pins and weigh 525 grams without the pins, they're really nice light pieces. They're full floaters. The Scat H beams run around 4 bills.

For what you have I'd call summit and just order one of there rebuild kits. Assuming you'll have the block squared and the heads done. I'd use the piston the gets you as close to 9:1 as possible. You could mill the heads .030 and use the steel shim gasket and you should have decent compression. As for rods, tons of choices out there for a decent price. Even a stock LY would work fine. I had a similar build and used the summit 488 cam and it worked very well. You might want to call a "cam guy" and have one cut for your application. FWIW my maybe 9:1 unported 906 headed 67 440 coronet went 12.90 @ 104.

Sounds like you're looking to keep it tame. Might as well keep the budget down on this one then too. I would suggest the TRW 2355 pistons. They are basically a stock replacement 1970 6-pack piston. They have around a 2.06 compression height so you can deck the block a little to get zero deck and run quench if you choose to run closed chambered heads. If you're running 906's then it doesn't really matter. The 2355's are close enough in weight to stock pistons that if you reuse your original rods, I wouldn't bother rebalancing. For what you're doing, the "big" summit cam would do the job nicely and not require a gear or converter change if used with those pistons.