Can I reach 275HP & 340lb/ft with this setup?

[redz 1970 K5]

My goal is to get more out of the motor by applying a balanced approach. I have trouble getting into the internals of this particular 350 because it doesn't leak, has great compression and runs good.

This is my hauler, and she is a bit of a dog when loaded down. This is what it has:

- Doug Thorley tri-y's and y-pipe
- Walker high flow cat
- Flowmaster 40 series Delta flow
- K&N drop in
- 4.56's (with 37" tires) pretty much wash
- All else stock

This is what I want to add:

- Edelbrock 3704 TBI intake
- 1.6 roller tipped rockers (self aligning, narrow) $80/set *
- Xefi Bored out throttle body 46mm(decided to scrap Holley TBI)
- AFPR (Adj Fuel Pressure Regulator)
- Injector pod riser (just because it comes with throttle body)
- MSD 6A, 8.5mm wires and blaster coil

* Given the truck's stock cam 179/194 (int/exh) duration and lift .350/.384 with the 1.5 rockers, I will get .384/.410 lift with the 1.6 rockers. The valves will also open and close slightly earlier and later as a result even though I don't think it will have an impact on actual duration. I also don't think I will need to change valve springs?

So, I am increasing airflow INTO the heads with the K&N and throttle body, allowing more air and fuel into the heads with the taller rockers, getting more complete burn with the MSD ignition, and more efficiently expelling the exhaust through the headers and custom exhaust. To top it off, I will be able to tune fuel pressure and get a tuned chip to get the fuel delivery just right. This is all without ever pulling a cam or head off.

Say I started with 235 HP / 300 LB/FT torque, I would be happy if these things altogether gave me an extra 40 HP and 40 LB/FT torque with still good drivability.

Is this a pipe dream here or do you think I will reach my goal with success with this setup?