One of my favorite places to visit these days doesn't include white, sandy beaches, it's a site called Jalopnik. It seems to have everything an automotive junkie could want and then some. Case and point -- the Engine of the Day series. There are Subaru EJs, Volvos, etc. I think it's a little known corner of this vast area that is Jalopnik. While you may not always care for their pick, it's always entertaining.
How
about an engine family that stayed in front-line service from 1964
through 2006, powering everything from the Rambler American to the AMC
Gremlin to the Jeep Cherokee, with a few years of IHC Scouts thrown in
for good measure? Starting with the 138-horspower Typhoon 232, the
engine evolved into the 199, 258, and 4.0 engines used in just about
everything AMC and Jeep made for decade after decade. You can even get
one with Renault/Bendix fuel injection (but we don't recommend it). [Wikipedia, Novak Conversions]