i knew someone would start saying this :cool:
every engine has its design flaws, you either work around them, or spend the money on something better. having both manifolds on the same side of the head, bugger all capacity, a fuel line that is likely to crack and spray petrol on the distributor, and needle and seat that get stuck and leave you stranded several hours from home aren't necessarily good points about an engine either, yet we stick with our beloved K engines because they are cheap/free
i wouldn't spend big dollars on it cos it's just not worth it, if CA20s were that good then everyone would be building them, but they're not so nobody really is. if you can get the for free, do your mounts and efi fuel system and wiring on the cheap then go for it. you're going to have to engineer it and probably upgrade brakes. you could think of all that stuff as an investment, and stick in a CA18DE or something else powerful and efi which is better later on
if it's going to cost you alot of money, then spend the little extra and start with a decent engine to begin with, you'll end up with a lot better and more reliable and powerful car with more potential
that's just how i would do it anyway, it seems logical enough on paper