Strange cam specs

I have seen this a thousand times, the truck has no low end power as the cam is way to big for what you have. I would be willing to bet that the truck has a stock converter, stock highway gears and the factory 8:1 (if you lucky) compression. I used to own a speed shop back in the 80's and 90's and people thought that the bigger the cam, the more power they would make, and nothing can be further from the truth. With the right combination of parts a bigger cam will usually make more power, but in a stock smog era engine it will absolutely kill all the power the engine has. If you have a stock carburetor it will also be difficult to make it idle correctly. The cam may have some worn lobes to boot, but that is not the issue, the issue is that the cam is just way to big for what you there. Only easy solution is to change to a very mild performance cam, something like a stock 340 cam.