It should have become easy, but it hasn't.
Non-cross-flow engine with the carbs/exhaust on the right narrows the field, as does the beam front axle.
The steering column seems to disappear forwards but not show underbonnet.
It is also not easy to get the scale of the beast, but it seems smaller than it looked at first (scaling by the twin-end SU pump).
MG TC would fit, but not with that oil filler or steering column.