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With an automatic you will need a higher stall converter the bigger (and more lumpy) the cam you go.
The higher your stall converter the more fuel you'll use and generally the more 'difficult ' you will find your daily drive.
Your bigger cams require you to be closer to the power band (+3500 rpm) to run right otherwise you'll literally limp along while Toyota Corollas fly past you due to the lack of low end torque and vehicle weight.
You can really regret doing this if you aren't sure what you're after.
I'd see if there's anyone near you (with an LS3) who can show you what cam they have and how the car responds. There's little sense spending that kind of money on something you might loathe in the end.
Don't bother with cams. Just stick a blower on and have the power everywhere
Cams are so 1980s
It's blowers and turbo's now
I appreciate all the info guys.
Thanks.