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with a 2.94 first gear and a .74 6th gear

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6th gear? You mean 4th? Or is there some aftermarket version of this transmission that has more gears?

Only 4L80e I had was in my 2500HD truck...it was flawless for 150k miles.
I wouldn't use a 4L60e behind anything making decent power. I've blown up 4 of them behind some pretty mild GM LS motors.

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oh crap, I thought they were a 6 speed like this TCI
http://www.tciauto.com/tc/transmission-packages.html/?main=4

goes to show how smart I am

and the gear ratios I posted are wrong too, lol. I suck

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The 4L80e is basically a big electronic 4 speed overdrive TH400. The 4L60e is comparable to the TH350.
The 4L80e is a good trans for what you want to do, it's just physically big.