Advice needed for Noob

[swissarmychainsaw]

I know this might be a stretch for this forum, but I could use some feedback.
When I say "LS motor" to my friends, they just get a far-away look in their eyes...

I'm looking at picking up a very clean original suburban, it just so happens to have an LS engine in it.

Years back I look into LS motors, but never owned/operated or touched one.
The addition of computers and all that shied me away at the time.

This one has a 6.0 with a CARB.
When I went to look at it, it was not running great and the guy said he just threw a carb on it that he had.

He will sell me the truck with or without the LS motor. With out the motor the truck is a good buy for the condition, with the motor, add about $3500

My question:
Should I keep this LS engine, or have him pull it?

Pros: Seems like he did lots of work to get that in there, and having a carbed LS motor for $3500 installed seems like a pretty good deal.
(It will need a new carb or even the stock fuel system which I know would be more cost etc)
* I kind of like the simplicity of running a carb on the LS motor, but it might be dumb!

Cons: Never buy a vehicle that runs like crap.
I would need to go through this thing and make sure all the small stuff is done right.

Thoughts on this? thanks for your time!