Never a V6 in the 1st Gen, except maybe retrofits by owners. The 68 Model had as the standard a straight inline 6 cylinder 230 cu in engine or a 327 cu in 210 hp V8. with a 3 spd, 4 spd or 2 spd Powerglide auto transmission. Optional engines were the straight inline 6 cylinder 250 cu in, a 327 cu in 275 hp V8, a 350 cu in 295 hp V8, a 327 cu in 210 hp V8, a 396 cu in 325 hp V8. Transmissions available were the same 3 as above, except 396 had a turbo hydramatic,
67 models had the same engines & transmission line up.
The 69 had slightly different engines. a single 327 275 ho engine 2 350 one with 255 hp and one with 300 hp. The inline 6s and the BB 396 were the same. Transmissions were the same with the addition of the manually shifted 2 speed Torque Drive transmission as an option on the inline 6 engine.