At the only Shelbyfest I've managed to get to I was up for best sounding Cobra. It was down to me and a big Block ford powered car and the ford took it.
I don't know if mine was better sounding, I think it was just the loudest thing there. Not sure why though...
There's some very fine sounding LS motors out there too. With a cam and some free breathing pipes they sound pretty good to me.
I picked up an MS4 cam for mine and they sound nuts as well as making good numbers. Fairly stock LS1 motors i.e stock bottom end and heads are regularly making 420+ RWHP with this cam and some tuning. It's lumpy and angry but makes a good noise and good power. Can't wait to drive it again.
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Mike Murphy
Melbourne Australia