1.8T 20V CONVERSION ADVICE PLEASE!!

i'VE DECIDED FINALLY TO DO A 1.8T CONVERSION ON MY MK1. A MATE OF MINE IS AN EXTREMELY COMPETENT MECHANIC AND SAID HE IS PREPARED TO TAKE THE JOB ON. HE'S ASKED ME TO FIND A DONOR CAR TO START WITH THEN TAKE IT FROM THERE. DOES ANYBODY HAVE A GUIDE HOW TO FOLLOW OUT THE CONVERSION AS I'M SURE WE WILL COME UP AGAINST ALOT OF HEAD SCRATCHING PROBLEMS DURING THE CONVERSION. FOR EXAMPLE  WHAT IS THE BEST VEHICLE DONOR CAR TO BUY AS THERE ARE ALOT OF CARS WITH THE 20V FITTED.DOES IT MAKE A DIFFERENCE WHETHER I BUY A VW PASSAT OR A SEAT LEON FOR EXAMPLE.
IF ANYBODY HAS ANY INFO IT WOULD BE GREATLY APPRECIATED.
CHEERS

JONNY

http://www.vwgolfmk1.org.uk/modules.php?name=Forums&file=viewtopic&t=94357

Do some searches on here and google, there's one or two real good sites, for reference. Club gti have some good threads on this conversion, funksoulkitty web site has some good descriptions, especially on how to fabricate the driver side engine mount.

Have a look at the Qpeng website. That has some good info on it.