Your question is very vague. There isn't a best year. Each has it's advantages and disadvantages. Most horsepower out of the box is very different than most horsepower you can produce out of a built engine. Motor wise, a lot of hardcore engine builders will opt for some of the older Legacy semi or fully closed deck engines. Those can be hard to come by now-a-days. You're better off telling us what your goal in the end is. And handling is a whole other animal.
"We live for a good time, not a long time."
RIP Colin McRae