Dino 308 GT4 2 + 2.
2.9L 240 HP
First Ferrari mid engine car except it was not badged with the prancing horse — it was a Dino.
I knew someone who had one until it dropped a valve (common to that V8) and he had to dump it to a speculator for next to nothing. The repairs easily outstripped the value.

Mondials are cheaper. The GT4 has (relatively) blown up in price over the last 4 years.

There's a 208GT4 for sale in michigan right now. Now that is the slowest Ferrari. Not necessarily the cheapest.