Isnt this the same kit Mitch Seff has on his?
2" carb suck through design. Simple and easy install, but technically not the most efficient method out there. (Not that that's a slur, just an observation).
This is the cheapest way to get a bunch more power out of a TR6 there is. Full stop.
Is it the best? No, but it's not the worst either.
Forget about triple carbs unless you did a whole bunch of other work to the engine, and if you did this will still likely outdo it for a street motor.
'Just' adding FI is going to cost you more than this, even going the (cheap) megasquirt route. By the time you bought all the sensors and plumbed them in, all the wiring you need, plus the time and effort to make a manifold (or worse, $ to have it made) and all the stupid ancilliary stuff, this starts to look like a good deal.
I know of what I speak, having just spent close on $1500 on parts to install the megasquirt - ECU was $400, the rest is on wire, crimps, tools, sensors and all. That doesn't count the cost of the manifold, throttle body, fuel injectors, fuel pump, regulator, and plumbing which I had already. Also this doesn't require a laptop to tune...
FI stuff is not cheap when you total it up. Yes you can get a bunch of it from the breakers yard, and save a couple of hundred $ but then thats not a fair comparison to something like this.
So why the diatribe? Just to say that if you want some more power, your engine is in good condition and you have some basic wrenching skills then this is the simplest way to get more oomph. You will likely have to add a fuel pump, but apart from that its a straight wrenching job.
And no I'm not buying it - if someone wants to swap it for an uninstalled megasquirt setup though PM me! I could fit this and save myself a whole heap of work...