The 2.6L that was mentioned above, was an Overhead Cam Hemi.
They left a lot to be desired though, with a list of problems as thick as a phonebook. But if you addressed those problems and threw a couple dollars at one, it would flat out run.
We were a little luckier in Australia, Over here they kept developing the cylinder heads up until the end of their production run in 1994. we also had multi-point injection from about 1984 onwards, when retro-fitting the late model parts onto an early rwd short motor it really wakes it up.
It's a very well kept secret, in my opinion.
My little car above would rev clean to 7000 RPM and keep up with a lot of factory turbo and v8 cars from a dig to about 80mph.
That being said, eventually it did just spin a big end....in it's defense it did have 240,000km on the clock.