Changing clutch

Im changing my clutch and flywheel and recomendations on wat stage to get 1 2 3 its a 1990 celica gt and wat else can i do to my engine while im am at it?

Change the cv joints+boots?

will that give me any added hp?

Got not much idea about it... Check your repair manual, it will help, most of the procedures and even parts are the same/similar. I think you can find also toyota clutch kits there on where you can have one... Goodluck!