The numbers may seem similar, but there were key differences between Mopar's 340, 383, and 440 engines. They included both ...

Mopar's LA-series small-block 360 is a solid performance design featuring a healthy 4-inch bore, a relatively long 3.58-inch stroke, long 6.123-inch rods, and a desirable 18-degree cylinder head ...

There are two inexpensive cylinder heads available for the 360-cubic-inch A engine. Both are high-swirl, fully cc'd, ported heads with 2.02-and 1.60-inch valves. They come completely assembled ...

Although it was available with an optional 383-ci (6.3-liter) big block, the 1968 GTS equipped with the standard high-output 340-ci (5.6-liter) small block was the best all-around performer.