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I could be wrong but I think most 408 setups for the 360 use the stock bore but gain displacement due to a longer stroke. So technically there isn't any machining, do a google for 408 stroker, there's a fairly nice setup out there for ~$1400.
issuez
hmmm..i know the 340 strokes to 421..i know someone who runs one, and it hauls. im not personally familiar with the 408 setup...it could be bore and stroke...
I have been seriously contemplating it Come next spring when I can ride my motorcycle on a regular basis, I am going to tear into the engine (360... obviously). I plan on going to a 408, and possibly supercharging too... not sure yet. I don't want to build up for HP though, it is going to be all about low end torque (obviously still more high end HP then stock...).