Your six banger isnt that bad of a motor, im running a destroked variant of it in my 53 right now and have no problems with it. There are aluminum high compression heads and dual carburetor intakes available used for it, check ebay. I came across a company that had dual exhaust for them, but there prices were insane. Still, these arent race motors, theyre better left stock or mildly warmed over. If you want more performance than just a daily driver then by all means find a decent small block mopar to put in her.