CQ/7A turbo conversion questions

[Chris Thorp]

I'm looking to do a turbo conversion on my '90 CQ.  I'm planning on 
rebuilding a motor and going to an aftermarket EFI system (probably 
Javad's).

What I've currently got:
A 1990 CQ with ~130kmi
A 5000cstq with ~210kmi

I was planning on doing an MC1 swap into the CQ, but the more I looked 
at it, the better turboing the 7A looked.  I know there has been a fair 
bit of discussion on this, but I have yet to find solid information on 
what it would take.  It looks like I could run the 7A's head as-is 
because it already had sodium filled exhaust valves, reasonable cams, 
and is a 20v.  I would need to make a header with appropriate flanges, 
do the intake and IC plumbing, lower the compression, and maybe better 
crank bearings.

To lower the compression, it looks like my options are: more/thicker 
headgaskets (kludge), or new pistons or connecting rods.  I did some 
calculations, and to get to 8:1 from 10.3:1 would take a rod that was 
3mm shorter.  Is calculation correct and doable?  Or would new pistons 
be a better/cheaper route?

Beyond these changes, what would I need to do?  As this is my first 
major project, am I missing something really obvious (it seems like this 
isn't really ever done)?

TIA,
Chris