I have the DSE sub, which we have just test fitted into my '69. It really is a remarkable piece of engineering. And the price is not actually much different, at least if you're using all new suspension components ... The DSE will fit all LSx oil pans, and will clear a stock F-Body A/C compressor, if that matters. Ultimately, the choice of DSE partly came down to wanting front and rear suspension (Q-link) engineered together, thus having one fewer vendor to deal with in getting things set up the way I want when I hit the track.
I have a Morrison Tri-5 chassis in my wife's '55, and that is also a terrific piece. Both companies are great to deal with from a customer service perspective, so you really can't go wrong either way.
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