Horse Power and Torque

Good afternoon all,
I have never posted a thread as this before so here goes, I'm putting my car on a chassis dyno at the local college I work at (Palomar College Welding Instructor). Any how I'll get two pulls for forty dollars and a chance to do a bit of tuning if needed. Car is a 1974 Challenger (in my sig.) not an A body I know but a mopar anyhow. Plus this site gets a lot more traffic than E bodies only. So what do you think it will make for HP and Torque at the wheels as this is a chassis dyno. Specs to follow and I'll post results tomorrow.
Engine: 1975 360 .030 over
Pistons: KB107's not sure on the true compression ratio but I have between 180 and 185 cranking compression all plugs removed and the carb wide open for the test.
Cam: Comp cam XE268 installed as per cam card recommendation of 106 I think it came in at 105.5 if I recall
Heads: J heads with 2.02 intake and 1.60 exhaust valves with a bit of port work done to them years ago. They were milled .050 back in the 90's to raise compression on another 360 I had.
Ignition: stock electronic with initial set at 20 and total limited to 33 with a FBO plate. When I don't put race fuel in it I can not set total above 29. This is all in at about 3000 RPM any faster and with more total it detonates.
Fuel: 1/2 tank of our wonderful 91 octane (CA.) and 5 gals of 110 octane leaded gas. (this is for the dyno pulls only) when I fill back up it will be back to 91 and 29 degrees total timing.
Intake and carb: LD340 with a 670 street avenger.
Exhaust: Stock Jeep Grand Cherokee manifold on the passenger side and an RT Dakota on the Drivers side. These are the bigger outlet manifold of between 2.125 and 2.25 opening.
Exhaust piping: true duals no crossover with 2.25 size and flowmaster 40 series mufflers to include 2.25 tail pipes to stock style tips I made back in 98, opened up the inlet to 2.25 and made stainless steel tips to match the old chrome tips.
Not sure if it matters but the Trans is a 727 with a 2800 stall. Rear-end 8 and 3/4 with 3.55 sure grip and the car weighs approximately 3900 with me in the drivers seat. I know heavy car but what do you expect for a 1974.
I'll post results tomorrow night. I'm hoping for at least 275-300 at the wheels for HP and 350 to 375 for torque. What do you all think.
Kevin
PS I won't be disappointed if I'm totally off base with the HP and Torque as it is a daily driver and not a race car. Super fun to drive, will light the tires up at will and I've had it 20 years now.