How much HP would you guess my 340 produces?

So I finally made contact with the guy who built my '72 Duster and I now have some of the history of this vehicle. Apparently it was a drag car that a previous owner ran somewhere in Florida for the past however many years. The PO decided to retire the car and turn it into a "street" car. The PO rebuilt the engine and refreshed the chassis before selling it to the gentlemen who finished restoring the car. The guy who finished the car then sold it to the dealer from whom I purchased it from.

These are the specs according to the man who finished building the car. He says that he thinks the engine produces about 350hp. I think that given the mods, it should produce closer to 400 but since it hasn't been on a dyno it's anybodys guess.

340 cid Mopar Engine. Blueprinted and balanced. .30 over. TRW flat top pistons. Mopar steel crank, Mopar performance rods. ARP fastners. Holley Sniper EFI with Hyperspark distributor. Professionally tuned. Edlebrock Aluminum Heads. Weiand Aluminum Intake. Comp cams hydraulic roller cam. 490/490 lift, 262 duration. 10.5-1 CR. MSD Blaster SS Coil. 8mm Plug Wires. Aluminum Radiator. 6-Blade Aluminum Cooling Fan. Hooker Ceramic Coated Long Tube Headers. 2.5ā€ Magnaflow exhaust.

I added the Holley Sniper and Hyperspark after I purchased the car. It originally came with an Edlebrock 600cfm carb. I also added the Autometer instrument cluster.

These are the rest of the specs if anyone is interested.

Wilwood 4-Wheel Disc Brakes. 6 piston front, 4 piston rear. Drilled and Slotted Front and Rear Rotors. Power brakes with silent electric rotary vacuum pump in trunk. Special limited edition American Racing classic Torque Thrust ā€œDā€18 Inch Wheels. Front Tires: 235/40 ZR/18. Rear Tires: 245/50/ZR18. Backspace 41/2 front, 51/2 rear. Hub stubs.
727 Torqueflite Automatic Transmission. Center Console shift. 3.91 Gear Ratio. 2400 stall converter. Dana 8 3/4 Rear. POSI Rear End. Moser axels w/5 on 4/3/4 hubs, front and rear. QAI powercoated front end with neoprene bushings. Tubular Upper Control Arms. Powder coated sub-frame and K member.

Autometer custom gauges insert. Black 340 Side Stripes. Black Carpeting. Black Dash. Black Door Panels. Black Headliner. Black Vinyl Interior. Chrome Front and Rear Bumpers. Driver Side Mirror. Duster 340 Tail Panel Decals. Fiberglass Hood and front fenders. Estimated 300 lb weight reduction. Hood pins. Front Bucket Seats. Hood Scoop. Matte Black Hood Stripe. Rear Bench Seat. Three point harness seat Belts. Sublime Green Exterior.
Only things that pertain directly to the amount of horsepower are the heads,compression ratio,cam, intake.
The rest are bells and whistles.

Id guess 370-385hp, maybe a few more.