Most parts are however, as we all know with bellett bits you have to look,find and adapt 
The g---w is in the same basket if you ring a parts suplier and rattle off that you want a part for either you will get the same reply awaaaht 
a bellett 
awaaaht The bottom end bearings are the same as the g---z,rings are the same also ie 1600,1800,2000 i assume as we did a g180 and used 180z rings not knowing much about the gemini engine i do not know if there displacement change is bore or stroke or both.
vrs kit is available from coventry auto parts/bursons
We had not replaced cam bearings as they were ok but a head shop with the right id i am sure they could tunnel bore to suit
if they could not be found.A forum has the recipe to convert mitsubishi timing chain and tesioner to suit.
Dizzy parts throw the old one away and use a g---z dizzy cut it to the right length shim the w gear drive to suit then the guts from a rb gemini will give you the option of electronic ign or fit the reluctor and it will talk to delco pulsar/camira efi.
We reused the sump gasket with ultra grey as this was not so easy to find. It would be nice to go to a parts supplier and say can i have a rebuild kit for a ...... but then we would all be driving a boring holden or ford
I rebuilt a chev 383 stroker for our ski boat a few years back sat on the phone for 15 minutes told the guys what i wanted gave them a credit card number and 2 days later at my feet. sweet but just toooo easy
no challange 
Waldo do you have a part number for the rebuilt kit i might put 2 in storage
for a rainy day as we have had a few lately.
sweet