273 Commando Top End Rebuild on my 65 Dart GT

PS - as i stated before - i need to find a thermostatic spring for the exhaust manifold on the passenger side.. i can find them EVERYWHERE for a chevy, but nowhere for a dodge.

thanks

I bought one from Mitchell Motor Parts for my 66 273. Here's a link to their site:
http://www.mmpar.com/AMS2015Web/default.aspx