22R Won't idle and rocks pretty bad

I bought a 1st gen with mild engine problems (I convinced myself that the price and potential was too good to pass up). I don't know for sure how long the truck sat, but it turns over with the help of some carb cleaner. The engine rocks pretty hard and doesn't idle. I just drained the gas (don't know how long that was in there) and will fill it when I get the new spark plugs. I cleaned the carb and found a lot of suspect hoses. A friend with similar problems suggested changing the main bearings too. Thoughts???

 

Thanks. I will be checking the fuel lines next. Updates coming soon. Also where do ya'll get parts from. LCE is where most of the people I know get their stuff, but it gets pricey.