1965 Valiant 200 convertible (minor project)

Took another look. The exhaust manifold has strengthening ribs on it that didn't come until later. Also, I see a rib on the block that wasn't there on earlier sixes. Finally, I'm not 100% positive, but I think you have a V8 radiator. It's certainly wider than the one in my 63, and also the upper radiator hose connection is in a different place. Again, none of these are necessarily bad, and for a driver are pretty much an improvement over original. (In fact, you may note that I have the later exhaust manifold on my 63.)