well i told you'll they were coming well i just got them yesterday. I'm about to install them i just wanted to show you what they were they are from this web site. http://www.2751engineering.com/2751parts.html
here are the block offs

 

are those the 13b block offs?..i don't see any 12a on that site

 

just the SE 13B and up stuff i talked to the guy the other day and he was saying there is not too much to block off with the 12A. but these things are put together very well it has all the plates even to block off the oil metering system. i bet you could use those for the 12A.

 

maybe some of the stuff on the side of the Lower intake manifold. i need a better pick than the ones i have to see if it would fit the 12A

 

does anyone have better pics of the 12A manifold or the omp they could be the same parts of close to the same openings