Looking at the engine on the left side just behind the water pump on a flat shoulder is the engine code. You will need to give that information to the Chevrolet dealer and he can tell you about it. You can go to one of the book stores and purchase a book.
4.00"
It should be a 5.7L 350
355
chevy 350
350...383 is a stroker motor, a 350 with a 400 crank and cam which increases the stroke and adds .3 liters of displacement.
It is a 350 Chevrolet motor. Also known as a 5.7 liter. There were many of them produced and the number you provided was stamped on engines made from 1987 to 1995.
350 cid
Th700-r4
The 90 Corvette had a 350 c.i. engine
Normally,a Small Block 350
7/16"
It depends on which heads whomever built the stroker motor decided to use.