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Car: 82 Berlinetta/57 Bel Air
Engine: LS1/LQ4
Transmission: 4L60E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
Differences (assuming it's a complete mid-70's engine):
Intake manifold mount bolts - the center two on each side on the '87 are at 72 degrees, whereas the older engine has all of the mount bolts at 90 degrees.
Rear main seal - the '87 is one-piece, and the older engine is 2-piece. The flexplate/flywheel is different between the two types.
Dip stick location - on the older engine, it's on the driver side, and gets in the way of the exhaust manifold. If you use headers, no problem.
Valve covers - the '87 heads use center bolts, the older engine uses perimeter bolts.
Oil galley ports - the '87 may use a port above the oil filter that the older engine doesn't have.
Externally, other than the above, the engines are identical.
Intake manifold mount bolts - the center two on each side on the '87 are at 72 degrees, whereas the older engine has all of the mount bolts at 90 degrees.
Rear main seal - the '87 is one-piece, and the older engine is 2-piece. The flexplate/flywheel is different between the two types.
Dip stick location - on the older engine, it's on the driver side, and gets in the way of the exhaust manifold. If you use headers, no problem.
Valve covers - the '87 heads use center bolts, the older engine uses perimeter bolts.
Oil galley ports - the '87 may use a port above the oil filter that the older engine doesn't have.
Externally, other than the above, the engines are identical.
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