Yes one can speculate how the connections were made!
At the time of the Tipo 33/3 and 33/3 TT Alfa had contact with formula 1 teams, like Cooper, McLaren and March to race their V8 Tipo 33 engines. Not significantly successful as the Cosworth engines were more powerful and reliable than the Alfas were.
So Alfa had to wait until the Boxer and V12 engines in cooperation with Brabham to achieve some success. During these trials they must have made many useful connections in the business!
The above mentioned Mc Laren car now seems to be a customer car made by a subcontractor of Mc Laren and came without engine. It should be entirely possible that Autodelta just bought one of those cars to have a look!
About the technicals the Mc Laren M6B is of boxed aluminium, while the Tipo 33/3 is of boxed steel reinforced with titanium.
Here some links to the McLaren M6A factory race car and the customer engine less race car M6B.
M6B -- Bruce McLaren Trust - History of motorsport racing legend and founder of McLaren F1 and Can-Am teams
M6A -- Bruce McLaren Trust - History of motorsport racing legend and founder of McLaren F1 and Can-Am teams
Last edited by Gabor K.; 02-01-2013 at 02:06 PM.