I did a thread a year or two ago about clutch fork angle and the geometry to get things adjusted correctly. For my car which uses a Hays "street" clutch and flywheel I suggest using the shortest "short" throwout bearing you can get. This helps get the fork angle to the best geometry. Most people think there are just two throwout bearings, "short" and "long". Truth is there are some subtle differences at least between the short ones. I would suggest # 614083 which is the shortest one. Keep in mind we are only talking about a difference of maybe 1/8" between these but that difference gets compounded when you get into the rest of the linkage, fork etc. This has a 1.185 overall length. It worked for me.....
Here's a link to the past thread
viewtopic.php?f=1&t=36355&start=15 Scroll through the entire thread as I have some pics to help see the differences.