A few months ago, I bought a sealed copy of the US LaserDisc of Mission Impossible. Although the mix seems to contain a minor error in at least one scene (slight crackling sound on one of the surround channels if I remember correctly, comparable to the crackling noise one can hear on the first US Blu-ray's PCM track of "Cars"), its AC3 mix is quite "beefy" and fun indeed.
Oddly though, a strange mix-up seem to have taken place at least with my copy since, despite being brand new until I had opened it, they put in twice the same disc with side 1 and 2, thus side 3 is missing. Some very weird manufacturer mistake.
Which is way I grabbed two other copies (PILF-2377) while being in Japan, where they are so cheap (down to 108¥ including VAT), one doesn't know whether to laugh or to cry. It contains the AC3 as well and probably it will be the same audio data as the US one, but only a check in the future will reveal.
Anyway, I'd be willing to rip the audio and provide it to this nice community as well once I'm back, which won't be before mid of July, though.