'restoring' my urq

[Bob]

Well, as stated... Ill be driving my UrQ daily now and I wanted to make
it more useable (read: quick).
Heres the lowdown...

Its an 85 so I want to keep it as close to stock as i can. This just
means keeping the stock parts in case I want to reverse any changes.
With that in mind, I picked up a balanced and blueprinted 20V motor for
it, with ECU and harness. Ill be dropping that in soon (next couple
weeks). It has reinforced hardware, but otherwise stock and should be
able to take decent boost pressures with the stock turbo.
So here are my questions:
If Im using this motor.. which clutch/flywheel do I use? 10v or 20v?
Is there anything else I should do while Im in there? 2b downpipe etc?

Any tips appreciated...
thanks
Bob