Installing a K member can be expensive and time consuming.
In most cases here it just isn't worthwhile or necessary and is a total waste of time and money. Dropping 50 lbs or whatever it is, is certainly not a cost effective way of going faster at $700+. Imagine what that 700 bucks could buy for better engine parts.
Not saying don't ever do it, but you should be out of other more sensible mods first.
When it comes to a modular swap it makes sense. Clearance and making the engine just drop right in make your life alot easier.
There really is only is 1 company that is a sure bet for fit, quality and support that would be MM (not sure if griggs does swap k's but i trust them too).
The OP is probably spending 15 grand plus on this project.
Might as well economize with the best, you really don't want to install one more than once. So debating the rest of them is kinda a moot point.