Marcos Maniacs

Hi all. I have just purchased a Marcos Martina which is only part 
built. It was started in 1993 and has not been touched for the last 8 
or so years.  As there is no engine ( or dash, interior or glass 
etc ) in the car, I am trying to decide what engine to use. The 
engine mounts are for the V6 Essex, but as this engine is getting a 
bit dated now, I am wondering about utilising something a bit newer. 
I have been told that the rover V8 bellhousing is too large for the 
tunnel ?. What about the granada 2.9 V6? Or has anybody fitted any 
other even more modern engine - Cosworth etc. 
I am also looking for any pictures of completed Martinas for ideas 
about trim, under bonnet positioning of bits and pieces etc.

Many thanks in advance for any information or help anybody can give.

Andy.