I dont know if anyone said this yet but the 325e is an economey version with smaller valves. It has less power the a 325i and "is." They didnt probuce a 328 in E30 form.
Heres a little run down so you dont get confused.
318i produced in 1984-85and had the M10 engine which is a 1.8
318i/is/iC which were produced in 91-92 had the M42 which was also a 1.8
325e/es was 85-88 and had a M20 2.7L engine
325i/is/iC/ix were produced 87-91 and had a M20 2.5L engine
And the M3 was 88-91 with a S14 2.3L engine. (4 cyl though)
Also whats the milage on that thing? Soemthing around what 120K?