Unleaded Head

[68vitesse]

Thinking of getting a head converted to unleaded for a MK1 2L Vitesse, I have two spare heads with the number V2921 cast on the top front. One has a number one cast between number two and three cylinder valves the other a number two, the head on the engine in the car has V2921 at the front and the number 306486 at the rear but does not have a number between the valves. Are these heads the same or have they come from different 2L engines i.e 2000 saloon? and perhaps different compression ratio.

Just found another head this has the V2921 number but not the others.

Thanks in advance

 

Regards

 

Paul