Greetings, I am new here and appreciate all the knowledge on this forum. I recently purchased a 1980 GMC High Sierra shortbed 4x4 as a basket case, mostly the engine and engine compartment needs to be reassembled. The previous owner said it had a good 305 installed with all new gaskets so I will need to reinstall all of the components, alt, power steering pump, fan, shroud, etc:, but not sure if everything is there yet as I have several boxes of parts. My questions are, what would I need to do to maximize HP Torque from the 305? I realize it is a smaller motor than the 350 that originally came with the truck and am a little concerned it will struggle with the 4x4. I also do not want to dump a lot of cash and time either and would prefer to stay with the current motor. I was thinking a cam, and new intake/carb setup? Headers or stock mani's? I will need to put in new exhaust from front to back, so dual turbo mufflers or single? What would be the suggested carb setup for this motor? How about a tpi retrofit? Worth it? Also, I live in Colorado, and we do have an air program here so I would need to be sure it meets emissions standards, not sure if I need air injection, cat, or what would be required.... seems a little daunting the task before me but if anyone has any advice that would be greatly appreciated!