The 2.73 rear axle (BP 0410G1) is the giveaway. That axle was "standard" on the two L6 engines and the base V8 (307/200). Yours appears to be original to the car going by the date (April 10th, 1969), so unless it was one of the L6 engines, it would have to be the base V8.
What's your VIN? This will at least tell us if your car was a V8 or an L6.