On the assembly line, Chrysler painted the exhaust manifold(s), the coolant bypass hose (which I don’t see installed yet) and even the battery ground cable all at one time. The paint on exhaust will not stay on – unless you use a high temp paint.
I do like your paint scheme – it looks impressive.
When painting an engine, I do like to get an extra heavy bead of paint at the (already assembled) gasket surfaces – just to help those gaskets seal better – but that is a personal thing (no need for anyone to start doing it). I have no proof it works better – but I see no reason why it wouldn’t.
That process would be hard to do in your case.
I also prefer to paint the engine without the exhaust manifold(s) in place – but that is a bit harder to do on a /6.
BudW