The Lagonda 6 is a plenty good engine for the car... given that it was in the late 50s and weighed around 3000 lbs.
A question remains, (since I see the dual exhausts on your car, and given that yours was of 58') is that the DBB (high performance) spec engine?
Or was the dual exhaust fitted there as an extra option available on the DBA spec engine to slightly improve the performance?
Anyway, thank you very much for sharing, as my pre DB4 knowledge is rather void as of right now...but I would really like a zoom- in if possible on the green plank in front of the car in pic #4.. wonder what it says..