Engine swap advice

Ok so did you get a new engine or a used engine out of another car? If it was out of another car did you swap sensors or just use what was on the engine you put in? If you just droped in an engine from a wrecking yard or another car then I would pull the coolant temp sensor off the engine that came out of the car and put it on the replacement engine. This is what turns on the fans. It is on or near the thermostat housing. Let me know what you can and how it goes.

Well you picked a truck engine and the truck engine was throttle body injection and the car is a 305 HO with tuned port injection the cams and compression are not the same. The cams are different and the heads are different. The TBI truck engine is cammed.234 and.257 with 1.84 and 1.50 valves and the 9.3:1 compression. The TPI car engine is cammed.269 and.276 with 1.94 and 1.60 valve and 9.5:1 compression. The Hp is different and torque. It will run rich and not have the power and such. As for the sensors you do have everything hooked up and pluged in? Double check everything and let me know what you find, do you have digital multi meter? We will need to test some sensors and maybe some wiring.

The 301 is a smaller motor thtn the 327. You'll need to change the mounts on the crossmember for the 327. You'll have some wiring issues to deal with as well.

If you go to a junk yard and get some mounts out of a camaro that had either a 305 or 350 in it they should work. Then just get new motor mounts for the 327/350 small block as that is what you'll need anyhow. Then check your trans to engine mount as you may need what they call a universal mount trans which wil mount to Pontiac or Chevrolet bolt patterns.

This is more trouble than it's worth. Depending on the year 4.3L you want to put in means all different kind of wires, computer etc. And if it's a motor after 1995 you can't anyhow because it's OBD2 as yours is OBD1