360 vs. 340 vs. 318

I am shopping for a powerplant for my 66S. I built a really healthy 440 last year, but I hear they are a total bear to install. I have a 360 that came with the car( its in there now). In your humble( :thumbup: ) opinions, which motor is gonna give me the best all round performance, 60% road, 40 % strip. Is the 340 more buiildup worthy, or is it a case of no replacement for displacement. [/IMG]