Those Rocket 16TPA high torque motors arent the best to power 13:1 ratio gears. You need at least 22TPA to get the best out of them.
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But then you are proposing to transplant the 621 std gears
to the 516 - so all do-able...
The issue with 516 boxes that are re-enforced at rear
is that 13:1's very often (not always, but mostly)
very often needs a bit of material removed on the arc
in the top half of box...
So to install 13:1's in the 516 you gotta do this...
So even super CERAMIC bearings can fail under spur
so sound advise for long term durability is bushing under spur
Anyway - the SHS gears "could" go in OK
but they are a bit more chunky/robust
especially on spur gear I have found
the bevel will fine - you might only need say 0.15mm on top
but should be within margins to shim up OK
Sector - should be also OK - might need only a 0.15
insted of say 0.25/0.30 on top but "should" be just about OK
(if really tight then replace sector top bushing with bearing)
It is the SPUR gear that sometimes in some builds
gets a little tight or close with room to shim up with
Admit I ain't got the 621 box that isn't re-enforced
but I have found these chunky SHS sets and some zci/bd 13:1's
well the 13:1 spur gets a whisker too tight in some builds
where it is all bushings (that are a bit thicker inside box)
Bearings sit more flush inside, but protrude a little more outside
So often if doing two exact same guns, 1 bushings & 1 bearings
the bushing gun will require slightly less shims
& the bearing gun will require a few more shims as there's
more play/room on the gear axles when installed
This bushing/bearing play bollox is common to all guns
not just qwirky Cyma's, bushings tend to use less shims
I'd suggest getting a set of 8mm bearings for top of spur
and maybe sector if required
If there was an ultra ultra wafer thin lack of play on spur
then you can remove the bushing and place on some
emery paper going in circles to reduce a whisker off it
Though being steel(ish) you will be there a while
trying to reduce the thickness of the bushing
(quite a fucking while if it is fairly tight)
you ain't gonna sand it down much - even on coarse emery
then onto finer emery paper to finish, clean & refit
Yeah it is a pain & can't reduce it much at all
but I've done it to a top bushing on bevel
with almost no shim room on a ultra chunky bushing
sanded it for AAAAGGGGEEEEEESSSSSS
then used a very thin 0.10mm - well the most worn one
at 0.085mm on top and yup, it finally worked out OK
(could have used a bearing on top of bevel but wanted bushing)
So yeah some things to watch out for - if the SHS are too chunky
as said - the more you change & upgrade the more "fun" you can encounter with various issues that "may" arise in "some" builds
you might be lucky & OK - if you had quite a bit of shimming room in the 621 - particularly on the Spur side of things
but my gut tells me it will very likely be a more more snug/chunky than the stock Cyma gears
so consider adding some 8mm bearings for top of spur & maybe sector - just in case