Here is a useful thread from a site i have belonged to for quite a few years now:
http://www.subaru-svx.net/forum/showthread.php?t=35610
I have both an SVX with the EG33 in it and a 73 240Z which is why I am reading stuff from this site.
I hope this little bit of info can be useful to someone on here. I can provide more info and other links on this subject if needed.
Have a nice weekend all.