mine moves quite a bit too, about 3mm or something.
i thought that this was normal and havn't thought of it since.
everything seems to be running fine though.
let me know how you get on as i am interested to see if this is normal or not. we might both be looking for a new TB, hehe.
Richard
try pick n payless, they had a few AE82 twin cams out there before but i don't think they would last long.
i may be wrong but i think the only sifference with them is the earlier ones had a different kind of idle up for cold start, thasts just from memory though....