Can anyone see a problem using a box to flow coolant through? My intake is a very old Clifford which has a squarish machined area on the bottom, with four tapped holes, presumably to use with the old exhaust heat riser. I built an alminum "heat box" to bolt to the underside of the intake to run coolant through, as opposed to welding tubing to it that would run the entire manifold length. I imagine this will centralize the heat at the base of the carb. Any thpoughts? Is there a possibility of the intake harge getting too hot with this kind of setup?