If you are making a purchase money second, but are not the lender for the 1st mortgage, are the Special Information Booklet and mortgage servicing disclosure statement required disclosures?

I would say yes for the booklet because it's a purchase transaction, but I would say no for the Servicing Transfer Disclosure since it's not a first lien.

Since it is a 2nd lien transaction, no early TIL, right?

You do need an early TIL - see 226.19(a)

Just because this is a subordinate lien, doesn't mean anything is exempt (other than the Servicing Disclosure - which some are not even providing now). Treat just like any other purchase loan (HUD-1, P-TIL, etc.).