I have upgraded the block on an original Floyd or two - swapped them out with large brass blocks - which actually required minor trem-cavity modification - though, you can find blocks which don't require those modifications, if "modification" isn't your thing..
In my own experience, adding a larger brass block really improved the the overall tone ... "warmer" ..more rounded.. "richer" .... to-me Immediately Noticeable. There is something to doing that kind of upgrade; though, I would guess, if you are a-chugga-chuggin' all night long, then the results might seem less impressive. Having said that, I seem to remember that that particular upgrade rounded off the harsher edges and added a richer smoothness to distorted presets..
Been a while since I have done that upgrade since you can buy after-market trem systems with brass blocks stock. Another reason I tend to like the Gotoh locking trems - they're all I install on new builds these days.
Killer Guitar Components - that's where I bought my blocks.. Been a while, but great customer service and communication it seems.. just searched my email archives, ...seems I bought those blocks in 2011 ... :0) ..chatted with Rick quite extensively-it looks like. Nice guy!
Have fun. Best of luck! :0)
