Check the wires first
Yes, and it will increase torque
no it would be carbureted, not fuel injected
Not likely since the 93 Caprice 305 was fuel-injected and the 86 Monte Carlo 305 was carbureted
Misfire code
Trouble code P0305 means:Cylinder No.5 misfire detected
P0305 , engine cylinder # 5 misfire detected
P0305 means that the # 5 engine cylinder has a misfire
Typical new carbureted engine well tuned:1 x HP per each 25 cc
No real problems it is a solid engine.
Throttle position sensor
A 305 carbureted engine typically requires a minimal number of wires, primarily for the ignition system and any sensors. Generally, this includes two wires for the ignition coil and a few additional wires for components like the starter, alternator, and any other electrical accessories. The exact number can vary based on modifications and specific configurations, but it's generally around 5 to 10 wires for basic functionality.
A 1987 Chevy Caprice Classic with the original engine does have a carb and the engine is a 305, because I have one. This can have a 307. I have an 87 Caprice Estate Wagon, with a 5.0 liter 307 olds. Which, is actually for sale.