Go a natural ca18 With fuel injection. It will be much more cost effective and it will give better economy.
Wiring up the harness isn't as complicated as it seems, once you had a good look.
Putting carbs on a fuel injected motor is going backwards and will cost more in time, money and effort than its worth.
Spending bulk dollars on an l series or a series will be a waste unless for some reason you cant live without a particular type of engine.
A mate has just put a sr20de into a early corrolla with custom pipes(4 into 1) and system and it sounds like an oldschool L series with webbers. Just goes a hell of a lot faster than all but the most expensively worked l series.
Personally i would chuck the ca18det at it.
No L or A series will give the same bang for buck. Anyone who reckons otherwise has never driven a ca turbo in a 1200 or 120y.