Pick an engine that will fit in the vehicle and provide the power necessary to propel the vehicle to your liking. Really, the choice is up to you. What do you want the vehicle to do? Is this a race car, or a daily driver? The answer to that question will determine the engine choice.
What engine and car they were designed to fit.
Turbosmart BOV's are designed to improve the performance of the turbocharger system. They will not usually damage a car engine.
The car will start to overheat and if ignored will sieze the engine, causing it to need either totally rebuilt or totally replaced (ussually cheaper)
No, the engine will not fit. The engine of 1999 is designed to be compatible with the car's other parts, but if you were to put a 1998 engine into a 1999 car it would not work properly.
The car engine will be totally inoperative!
If an engine overheats the metal parts expand and the engine will seize up. A seized engine is usually unrepairable.
No. Don't even try it. Totally different ECMs, engine mounts, and transmissions. Just buy a car with the 3.8L.
Yes. Totally! If the engine mounts are bad the whole car will vibrate and run bad. Get it fixed.
No. they are two different engine types. A car engine might be used to propel a small airplane with a prop if you could solve cooling issues and keep the carburetor from icing but a jet engine is totally and completely different.
Depends on how many it was designed to run with, for example a small motorcycle engine or lawnmower engine can have just 1 cylinder, however a car engine with a fault might not have all cylinders burning efficiently, and will still run on less than designed to, but nit well or efficiently
Can, of course you can. Should you, no, not unless you want to totally destroy your engine. Stop driving this car immediately until you can have it repaired.
Sure, if you want to totally destroy the engine. The more you run the engine the more damage is done to the bearings and rings.