Go the baby seat! Have 2 in the back of my Escort. Always like to see our cars earning their keep.
Well the first and most important thing is I can't see any rust.

And you've sorted the steering / suspension / brakes first.
You won't see much/any improvement from just bolting on the 45 without extractors and upping the cam. Except for using more fuel.
What year is it? Looks 1977 or younger based on the highback seats and side tank filler blanking plate. It probably will have low compression engine with single throat carby. If so, a higher lift cam and carby won't be as an effective upgrade compared with a high compression engine. If you're after cheap performance you might be better off chucking a 2L into it or chasing down a high comp 1600 with 32/36 weber in the Quokka/ebay. Or turbo existing engine.
Pop into Pitstop bookshop in King St and grab a copy of "Ford Escort Downunder" for $15 and you'll learn a lot about what you've got as it explains the codes on the VIN plates - including LC or HC engine.
All up, good buy. Looks tidy and tight. Easy to burn a pile of $ getting a dodgey car up to rego status.