914-6 Conversion Buying Help Wanted, what do I need to now about sixes Options

[VegasRacer]

I have owned a few 914-4's. I think I know most of the basics to find a good one.
What do I need to know about 6 conversions to buy a good one for street use?

I have lots of 911 parts on my 4 cyl. race car, but I don't know that much about 6 cyl. motors.
What are the +'s and -'s of a 2.4, 2.7, 3.0, 3.2.
I know there are some good ones out there, but I have heard many negs about 2.7's.

What upgrades (trans, brakes, cooling, etc) are necessary/recommended and what are optional?
How much do I need to spend to get a nice one?
What do I need to look for? What are some of the warning signs to avoid?

I know that a original 914-6 chassis is probably the best choice.
Are any other years better suited than others?

I have driven a few stock 914-6's but I think I can find a better fun/dollar ratio with a conversion.

Your advice/experience would be greatly appreciated.
Anybody got one for sale???