307 torque build

[Coalkracker]

So spring is right around the corner and once it starts warming up i will be replacing my valve seals in the heads of my 70 c10. I bought this truck to work and thats exactly what it will get used for. I will be hauling coal with it a few times a year along with other things such as pulling a stump or two and other general work here and there. My truck came with a 307 and i plan on keeping it, it has really amazed me how it has lasted through the years and is still going without any work done to it. Once i remove the heads from the block i figure it would be a good time to possibly upgrade the cam and maybe a few other things. Im not looking to dump a ton of money into it but to add a few upgrades that will give me more torque at the very bottom end. From idle up to 2000-2500 rpm is what im looking for. Im not looking to put a set of high flow heads or a giant carb on my engine that will give me a ton of flow at high rpm. I want a low rpm high torque work engine. Can anybody throw some suggestions my way?