steve .. you are very wise in your advice .. but what the heck is a manual electric radiator fan????
But yes .. steves right, LT1's usually leak around the rear of the manfold. Its easily fixed but popping the intake off and resealing it.
The headlights sometime get loose off the gears and the gears sometime may strip. Easily (and Free) to fix that.
Don't let them be a deter to buy it though. Pending the price, and body condition, the LT1 is a stout motor.