Without knowing what engine you are running,
The S2s if Ford, were a pre- Crossflow variety, with dual DCOE above the exhaust manifold and incorporting a swirl pot and not running a thermostat but a restrictor. To assist in cooling, you could change to the smaller diameter steel billet lower crankshaft pulley available from Burton, maybe from Pegasus. This will slow down the coolant flow which gets more dwell time heat conduction, give a small gain in performance, and not grenade. I have heard good things about RedLine Watter Wetter.
With carbs, heat soak and vapor lock is often a problem. If they ate above the exhaust, a heat shield under the carbs is popular. If using a mechanical peel pump, use an insulating spacer. If you want to go through the trouble, having a non-passive pump on a timer that draws fuel through the carb supply and into the tank for a few minutes after shutdown will help with heat soak.
Realize today's fuels made for injection evaporate more easily than the fuel these carbs were designed to run with. A good quality of today's fuel is it doesn't varnish as badly.