This is one with a V8 version of the engine in it the V12 is better because obviously its hugerer but also because its a 60 degree v rather than 90 degrees which means that you can get it all under the original bonnet profile (although you need to add about 6 inches in length).
Spot on Olly.
1926 H6B + 1928 12Mbr engine (27 litre, OHC, 6 carbs, compressed air starting, 24 spark plugs).
This is one with a V8 version of the engine in it the V12 is better because obviously its hugerer but also because its a 60 degree v rather than 90 degrees which means that you can get it all under the original bonnet profile (although you need to add about 6 inches in length).