Custom ground camshaft, low power

I've been told by multiple people that I have a poor choice in camshaft for my build. And according to the dyno I'm thinking they're right. Here's the specs I have;

Grind: HIFLOW1H
LOBE SEPERATION ANGLE : 108
OVERLAP : 80
INTAKE OPEN : 40
EXHAUST CLOSES : 40
INTAKE CLOSES : 76
EXHAUST OPENS : 76
RUNNING CLEARANCE : 0.00 HOT
VALVE LIFT (INT/EXH) : 0.472 / 0.472
DURATION (INT/EXH) : 296 / 296

CHECKING FIGURES AT .050 TAPPET RISE
OVERLAP : 12
INTAKE OPENS : 6
EXHAUST CLOSES : 6
INTAKE CLOSES : 42
EXHAUST OPENS : 42
DURATION INTAKE : 228
DURATION EXHAUST : 228
LOBE LIFT INTAKE : .315


This is in a 74 duster with a 440 (just rebuilt) and a 4 speed. 3.55 rear gear and 27" tires. I'm using stealth aluminum heads, a dual plane edelbrock rpm intake, a Holley 870, Schumacher headers with 1 5/8 primary and 3" exhuast.

I dont know a whole lot about what makes a good cam and I'm not entirely sure whats wrong with the cam I have. After looking at my cam numbers compared to several cams on summit it looks like the main difference is that I have low lift compared to similar cams. If this is the only issue couldn't I just use some 1.6 rockers to increase lift? According to my math 1.6 rockers would give me similar numbers to the mopar performance 509 cam. .504 lift, 108 lsa, and 296 duration instead of 292. Is there something I'm overlooking? I know this is somewhat a band aid for the real problem but I figure I'll be able to use the 1.6 rockers with a new cam down the road anyways. What do you guys think? Open to suggestions.

Right now I have stock worn out 1.5/1.4 rockers.