A 6.0 Cubic liter engine is APX. 366 cubic inches. A 5.3 liter engine is 323 (advertised as a 327) cubic inches. A 8.1 liter is 494 cubic inches.
If you assume that 1 liter = 61.01 cubic inches, then a 5.3 liter engine displaces 323.353 cubic inches.
The original engine was 2.3 liters or 140 cubic inches. It also occasionally came with the 2.5 liter "iron duke" engine at 151 cubic inches. Most of the specifications are the same as the Chevy Vega of that era.
364 cubic inches.
494 cubic inches.
293 cubic inches.
317 cubic inches.
About 378 cubic inches.
347 cubic inches.
494.3 cubic inches.
231.9 cubic inches.
153 cubic inches