i wanna go V8

[nogo]

hello all, i wanna go a v8. Im thinking of an LS, not sure which one but i have to daily this car so id like to try go something with alright economy. I have a few questions if could help me out that would be unreal.
1. what type of fuel economy would i roughly get with a LS 1,2,3? (running 35's)
2. which one is most reliable?
3. how much would is roughly cost to put one in professionally?
4. is there any other V8's i should look into?

I have this Chev V8 to Landcruiser 4 & 5 speed conversion kit for sale if you're interested?