Advice around 170 slant carb and engine swap

So I have a 1964 valiant signet that I'm trying to get up and running. My long term vision is to eventually swap the 170 for a 360. Right now my priority is to get the car into running order so it can be moved if needed. It seems to have a Carter bbs on it which is causing issues with getting it to run. My father in law seems to believe that the carb needs to be completely replaced as opposed to just cleaned up and rebuilt. The 170 exhaust manifold is also cracked and leaking. I'm not looking to spend a ton of money on the 170 because my goal is to envitably swap it.

Looking for some thoughts on what would it take and cost to get this running vs how much would I need to spend to just expedite the engine swap?