[DanEC]

A little different tack - your temperatures don't sound like anything to worry about based on your description so far. But, it may pay to check your timing and make sure it's where it needs to be and is not retarded. Also, if you have vacuum advance on your distributor (probably not) be sure it's hooked up to a manifold source of vacuum. You don't want ported vacuum advance - that's a 60's era pollution control device.

Insufficient timing advance is a major contributor to engine overheating - especially around town and at low speeds.