Engine
230 cu in (3.8 L) Chevrolet I6
235.5 cu in (3.9 L) Chevrolet I6
283 cu in (4.6 L) Small-Block V8
327 cu in (5.4 L) Small-Block V8
348 cu in (5.7 L) Big-Block V8
409 cu in (6.7 L) Big-Block V8 

Transmission
3-speed manual
4-speed manual
2-speed Powerglide auto

Chevrolet Bel Air on Wikipedia

Chevrolet Bel Air tech specs on www.automobile-catalog.com