Lots of bolt on things like T4 turbo and air box (if still there) the block will have smaller core plugs but you might need a mirror to see them under the turbo. 8 injector set up of course. Battery tray corner sawn off to accommodate it. Look underneath and see if the rear beam has the extended fittings for the trailing arms.

The build number plaque means nothing btw, they were added after a show in syon park about 10 years ago.

But why not check out this page too... save me typing

http://www.rs500cosworth.com/buyers_guide.html

Paul at N.Yorks spares is the reg. and is very helpful - they know most of the cars in the club so if you know the chassis number they can check it for you.