Another thing is there is lots of room in the radiator area to re-core and add one or two extra rows of fins. It is usually not too expensive to have a radiator re-cored compared to a new one.

I have seen the 560 aluminum radiators new for less than $400. Ideally a new aluminum thicker core with aluminum top and bottom tanks (stock are plastic) would be both lighter and transfer heat much better than a brass one.

I too like ceramic coated exhaust manifolds, but try rapping them with muffler or header tape, keeps the heat in the exhausts and cuts engine bay heat a lot more than the coated manifolds.

I am taking the exhaust on my 1977 450 SLC with 33K miles to 2.25 inches with dual 2.25 inch catalytic converters and a Borla dual 2.25 in/2.25 inch outlet muffler. Much of the exhaust system will be wrapped with header tape. This cuts heat and noise to the engine compartment. My muffler now sticks down below the rear of the car, I hate it.

So cats and mufflers will be under middle of car and new dual 2.25 inch exhaust pipes will exit below the rear of the car. At least you don't have to worry about cat converters.