I had an MG Midget, only real problem I had was wiring. I bought the entire wiring harness, just ran it and left the old harness in place, didn;t have any more problems.
I also had a fiat Spyder, looked like the Alfa Spyder. Burned oil, body rough, but I loved to drive that car. The only real issue I had with it, other than oil was thermostats. Luckily they where under the dash and easily replaced.