sitting there idling I got a feeling that's normal. I don't see boiling, I see normal bubbles. it don't take but a little fuel to make it idle. the filter is not gonna stay full all of the time, it can't. if its boiling you can stop it with some tin foil, wrap the fuel line and see. I,ve run cars 230 degrees, a lot of times and the fuel didn't boil. I' ve had the fuel to boil with the motor cooler than that, but I always found a reason, line to close to the header or laying on the block. a new rad. may fix your heating problem, but I don't think its gonna fix your running problem. nice pic.