2500 in parts alone is expensive for NA where he can use a Z18et
setup or go Draw through turbo which is cheaper and has more potential
with stock rebuilt bottom end. L series are mostly bullet proof and wont
need to go over 6500rpm to make 150hp ate or 150hp atw.

DIY
Log style manifold 250-400 aud, NOS equiv non ball bearing T28 or T3
direct from Japan 600 aud or rebuilt prob 400-500 aud, SU 150aud,
pipe work $150, DIY H2O inj $100 + tuning.

Turbo Parts alone 1000-1500aud or the cost of twin 45 carbs.
You can also find some turbo kits S/H for under 1K aud on Ozdat.com

Unfortunately a ka24 is too big in most states where the SR isnt and
all pollution engines.