Thump on engaging first gear
 

Car in neutral and clutch released..Then sometimes when I depress the clutch and engage first I feel and hear a little thump and slight forward thrust. It doesn't do it all the time. I'm trying to figure out what could cause that.

It's normal. If you wait 3-4 seconds between pressing in clutch and moving shifter, you won't hear the thunk. It is your syncros doing their job, no harm at all.

very normal...

http://www.ft86club.com/forums/showthread.php?t=12477

Mine does it when cold. In my case I consider it normal.
I've rarely noticed that in other car before (as in other make/model), but almost all motorcycle do that.