Hall-sensor usually has three wires. There is two-wire hall-sensors, on modern car ABS-wheel sensors, but usually sensors what are meant to use as crank trigger have three...
There is also VR-sensors, what can also used as crank sensor. They have only a coil inside, and when they have three wires, the third is only shield on cable. These also needs an amplifier, what hall-sensors doesn't need...
You can use carb as throttle body, but they usually restrict air flow. What I have on my engines, on other one there is throttel body, from Bx again. 19 GTi, with only one butterlfy connected. And on the other, throttle body from Xantia. And yes, too big throttle body makes tuning harder, and when going much too big, You can't get any reliable MAP signal, and engine gets more than enough air on very small throttle opening...
On some small cars, Daewoo Matiz for example, has throttle body as small as 32mm. Good for these small engines...
And one thing to remember, there isn't on almost none of the only way to do, and af course that makes also nearly no limits of parts to use...
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