engine part questions

well, for my xmas/b-day present i can get some new parts. This brings up a few questions...

I will be getting a FTI cam. Should i get new lifters and pushrods? If so, which ones should i get? They are all different length...

I think i had more questions, but i cant remember them now...
 
With TW heads, I think you will need stud mounted RR's instead of pedistals, and from what I have heard, longer pushrods are required with TW heads. Might want to call TFS and ask.