What's the weak link in my 440 build?

sbh126 said
Its been quite a while since I’ve made a post on here as I’ve been stationed in In Japan for the last three and a half years and my Duster has been in government storage. Anyways, I should be back in the states in the next few months and back to working on my car. I’m by no means an engine builder so I’d like to get some opinions on my current build and where improvements can be made to get some more power. I’d really love to get into the low 10’s. The car probably weighs around 3300 lbs and according to the online calculators I’ll need around 650hp.

Current set-up
440 with stock forged crank and reconditioned LY rods, Icon forged pistons, and unmodified stealth heads giving me 10.23:1 compression and .039 quench. Edelbrock RPM intake, Atomic EFI (rated to 620HP), and 2” fenderwell headers to 3.5” collector. MSD Digital 6AL and all MSD ignition components. Currently running a Comp solid roller cam with 110 LSA, 243* duration at .050, .550 lift but using 1.6 rockers so actual lift is around .587 and slightly more duration. 4 speed, 3.55 rear gear, and 26x11 M/T street radials. I’m not sure what kind of power I’m currently making and I’ve never had it to the track with this engine. Runs on 91 octane. With my current cam and heads my calculated dynamic compression is 7.77:1 and 156 cranking PSI.

Future plans
If the Atomic EFI system can’t keep up I’ll switch back to an 850 CFM Holley carb.

I’ve got some weight reduction plans.

I’m thinking about ordering the Trickflow 240 CNC ported heads and switching to a single plane Victor intake. I’m sure this will increase power but I’m concerned it will move my powerband up beyond 6500 RPM above where I’m comfortable spinning it with LY rods. I want to keep the engine somewhat streetable. The head change would give me 10.82 static compression. Calculated Dynamic compression would be 8.2:1 and 168 cranking PSI.

I’ve considered ordering a more aggressive cam but again, I don’t want to have to rev above 6500 in order to take advantage of it.

Is there anything I’m not considering? Is 650 hp even a reasonable goal on 91 octane? Where is my money best spent?

Shed weight, I run mid To high tens with a stroked 440 very consistently. Shedding weight is a great cost saving measure. Fiber glass is your friend. Your platform looks like a great starting point. AJ is spot on as always. We call it hammering but call it whatever you want , hammering, bucking, bunny hopping it is just a plain speed and equipment killer. And I am just north of 630hp on 91 octane. Disclaimer, I switched to EFI about two years ago. Frankly I think I gave up just a bit of HP but more than made up for it with consistency. Weather tunes at track are an art form. I have zero regrets. Everything about the car is better with EFI. My carb tuning skills are suspect at best and the EFI hides my ineptitude.