Need help with vortec 350 manual trans swap

[64stpside]

Morning fellas,
Finishing up my L31 vortec 350 build for my 64 step side and trying to figure the flywheel, clutch and starter situation.

Here's what in the truck now:

-1977 305 (lol...i know...hence the engine swap)
-factory 1964 bell housing and mechanical clutch linkage
-1992 world class S10 speed conversion

I know I have to drill and tap the vortec block for the z-bar ball stud ( i had to do it on the 305 that's in it now)

I know I need the vortec flywheel due to the 1 piece rear main seal.

My questions are:

1. Because there's very low mileage on the clutch that's in the truck now, can I use that clutch on the vortec flywheel?
The reason I ask is that the clutch for the vortec flywheel is 12 in and the clutch in the truck now is 11in.
I'm pretty sure the mounting is the same for a 10.5 and 11 is the same, is it the same for a 11 and 12 in clutch?
Will they interchange or do I need the vortec clutch?

Here a link to the vortec flywheel:
https://www.rockauto.com/en/moreinfo...1086&jsn=11086

Link to the vortec clutch:
https://www.rockauto.com/en/moreinfo...jsn=__GIP__4__

Link to the flywheel I have in it now:
https://www.rockauto.com/en/moreinfo...=8&jsn=8&jsn=8

Link to the clutch kit in it now:
https://www.rockauto.com/en/moreinfo...jsn=__GIP__4__


2. Because both the flywheel in the truck now and vortec flywheel are 168 tooth and have a 14 in outer diameter, I can I use the same starter, correct?

3. Because the pilot bearing in the truck now and the vortec one have a .59 inner diameter, there shouldn't be any issues?