Im planning on swapping out my 4.3L tbi for a carbureted 350

[Chevyman9243]

Im planning on swapping out my 1992 4.3l V6 t.b.i. out for a carbureted 350. This is all new to me and i was just wondering what i would need to do with the wiring harness for the throttle body since im not going to be going back to fuel injection. Do i need to get a new wiring harness or am i able to still use mine that came with the 4.3?

[Blue Bowtie]

There will be a bit more involved than simply eliminating the TBI.

If the transmission is a 700-R4, the ECM will need to be operational to lock the torque converter.

The ignition timing advance relies upon the ECM. Without a TPS, ignition reference pulses, and VSS, there will be nothing but base timing. Fuel efficiency and power will be terrible.

It would probably be easier and less costly to install a TBI and intake/distributor from a later 350 to eliminate these problems.

[Chevyman9243]

I have an NV3500 5 speed manual transmission. Is there anything i need to do to it or am i able to leave it alone?

[fast68chevy]

may have safety NSS switch on trans for starter engagement only in neutral range to bypass etc. can remove entire TBI engine harness and connect temp guage directly to old carb style temp sensor and same thing for oil pressure and etc,. easy and no problem. ECM harness is standalone separate on its own on pass side. fuel pump remove from the fuel tank unit and rteplace pump with same length of 3/8" fuel hose with a mesh strainer of some kind on end of it.