Re: 1967 running hot
A shroud helps and a 23" wide rad core radiator helps and a little higher curb idle, say 700-750 rpm and you've made sure you have no air in coolant system, maybe an 18-22 lb cap with recovery bottle.
With A/C on, condensor temp adds to the ambient air flow. You might as a science project, duct tape some cardboard between the header and core support on top and from the bottom of the valance to core support to aid against recirculation of hot air to see if this action helps. If this project hepls, a permament solution is in the future. A member here has the plans for an alum plate on top to bolt in or get one from ebay store. you're on your own on the bottom plate.
Heat soak happens when the engine is turned off, no movement of air, common occurence - could add an engine compartment thermal switch to monitor temp and turn on fan to cool compartment, then shuts off when, say 180°-190° is reached.
Engine temp of 200° isn't bad as most vehicles today run this hot.
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