It will make a huge difference, longer stroke, more displacement, larger capacity. Engines are just like huge air pumps, the more air you can get in and exhaust efficiently the faster they go.
Personally I would change the rods while you are there and the engine is open, Pauter sets are pretty reasonable and what we run. This may not be an option for the international lads (currency rates) but for most it's defo an option I would consider pending funds.
It's not really hard in our eyes, simply a case of using the bottom end, using some 4efte pistons (we advise low comp with a thinner gasket rather than a 10mm gasket!), some 5e rods, a 5e clutch and fly (like ACT and Aasco we don't advise re-drilling but everyone is different), 4efte sump or mod the 5e - oil return), use a 4efte head (you can whack some 5efhe cams in there if you have some). That's the major really, everything else in minor in comparison.
Gorgan your list is really good, maybe tuned more towards someone that doesn't have a GT or Glanza to begin with. If you have a 4efte to start with then most of it will already be there to use. We only charge another £300.00 + VAT to do a 5e conversion (excludes extra cost of parts and obviously engine!). That covers the extra labour nothing that complicated really.
Overall you can net some bloody good results as already proven in Japan, taking into account 200hp and 400hp cars the difference can be seen.
T