Pushrod length

You should be fine, but, remember, they span accross several parts. Any changes from stock on any part, adds up to a total change. If you mill .010 from a head, plus run the thinner MP gaskets and lose another .020, and the block's decks were "cleaned up" during a rebuild another .010, your pushrods' effective length just grew by .040, which may not be ok. So you should be checking lifter preload to make sure it's ok before you stick the intake back on.