Megajolt lt Junior is cheap as chips and rids all dizzies forever.

If you can use the Mitsu rods on a balanced bottom end, extractors,
shaved head and custom billet camshaft (only 179USD for a billet!!!)
and use the efi manifold that bolts straight up and run LPG you can
have alot of fun.
To go further than that you will need 10.5 compression, bigger valves
and porting which will be cheaper on an 8v than a 16v.

remember your stock 8v ca20 has only 8.5:1 compression ratio
Horsepower, 102hp @ 5200rpm and worse if worn out.

Going from 8.5:1 to 9.5:1 will make gains, also the camshaft is made
to peak at 5200rpm so if you use beefier rods, compression and a
camshaft designed to peak at 7000rpm then you will see a good engine.

Otherwise find a cheap ca18de and go from there but will all add up
about the same. You either work 16v or use 200cc more with 8v will all
end up about the same in the end. 84.5mm bores can be taken to 85mm.