Cam advice for more torque from 340

Thanks for everyone's insight. As you can tell I am a newb when it comes to engine internals.

Yes, I looked on the Crowler site and cant find the specs stated. This causes me pause when trying to change the cam. What if the guy was wrong and I spend time on putting in a cam with very similar numbers? Should there be any markings on the cam that can help me with identifying the specs? I have access to the engine now as I'm doing a suspension upgrade and have it all out of the car.

Do I have 10.5-1 compression? I don't know for sure, I did a compression test once and I think the PSIs were close to what they should be at 10.5-1.
The engine has been built up with KB pistons, titanium valves, and H beam rods and is connected to an 833 4 Speed ending in a 3.55 sure grip. (online calculators tell me its a 4.10 based on my RPM, tire size at 60 mph)

For timing I am at 8 degrees initial. I don't have a timing tape so I am limited to viewing 10 degrees with the timing light. The engine seems to like to be at 8 although im just basing that off idle.

I just watched a video on advancing the cam timing. Seems doable. I might take it into a local engine/dyno shop and give this a go. Although, seems like a dyno would be overkill for seat of the pants driving.

Sometimes this stuff is just frustrating.