99 lifter upgrade question.

if i buy 99 lifters they will fit in correctly rite? and how hard is it to change them? what all do i need to replace when i do this? just gaskets or what? thanks

They will fit right in. Here's what you need. (http://64.233.167.104/search?q=cache:51P9IupT3x8J:www.stealth316.com/misc/installing_new_lifters.doc+lifters&hl=en&ct=clnk&cd=1&gl=us)

here is a write-up on installing the lifters.http://www.stealth316.com/misc/installing_new_lifters.doc