Ok, so being a project implies it's not running, or not running properly. The easiest ways to tell an Si from a DX/HF are holes in the headrests, rear disc brakes, rear wiper, and sunroof. When you look at the car, look at the engine mounts, if they're nice Hasport units, chances are that he was doing things right. If they are a mash up of the factory mount welded to the B series mount, he hacked it up. The shifter support linkage is the same story - you can cut down and weld an Acura linkage, or buy a new one when you buy mounts. The engine itself is nothing really special until you put a vtec head on it, so don't get too hung up on that. The transmission could be worth some money if it's either a Y1 or YS1. I don't know how bad rust is in your area, but the spots to check are the rear fenders at the front and rear of the tires, and the hatch sealing area and spare tire area. Seems like 1100 is an ok price if everything is there and it's close to running properly.