sorry for the lengthy reply, but i have been looking for an original s14 e30 m3 for the right price for some time.
there should be matching vin tags on all panels. hood, trunk (under tool kit), fenders (front visible when hood is open and rears visible through gap on rear bumper by rear tires), doors, and engine block (near fuel rail). are they all in place?
are there any holes in the floor behind the front seats from a roll cage?
the door cards are not original door cards from an 88 as there is no plug for the manual window hand tool, was the interior color changed or was it purchased as a roller at some point, or a gutted track car?
do you have the factory radio and radio code, and was it in working condition when removed?
have the SI batteries been changed?
do you have pictures of the body prep work before he vinyl wrap?
was it stripped down to bare metal and then prepped?
where are the rear seat belts?
when was the last valve adjustment?
do you have cylinder compression numbers?
how does the rear diff sound?
fog lights, where are they and if have them are they complete with mounting hardware?
tools in the tool tray? whats missing?
how many keys?
alternator bushings been replaced recently?
engine rebuild? how many miles since rebuild?
oil consumption, how much over how many miles?
i have more questions but figured i would leave it here for now as this is already a book. also, the best place to sell this car would probably be s14.net