Pelican Parts Forums - More muffler questions

I have performed a few searches and read many past post about different exhaust systems but still cannot make up my mind. I have a 73T w/ CIS and SSIs and a stock muffler. The stock muffler has seen way to many years and neeeds to be replaced. It has a strange resonance which is not normal, so I beleive the interior is rusting badly. As of now my budget cannot handle the cost of a stainless muffler so my choices are a bursch, dansk, sebring, or a triad. I have found no info on the sebring unit. The simple, light look interests me. It is also cheap (I know you get what you pay for). I don't mind it being loud, but just not ricey. Any one have experience with these setups? Also, if I opt for the dansk pelican offers a version for carbs and a version for mechanical injection. What is the difference and which would run best with my CIS?

Thanks