1 The crank on the 4afe and the 4ag 20v are completely different the flywheels bolts on a 4afe is 6 holes and 4age 8 holes .
2 The ECU shouldn't be to hard to get can source them of ebay but
they have a couple of different types so would need to make sure it will plug in .
3 The fuel pump you have in your car now should be just fine for a standard 20v .
4 The throttle cables are different if you can mod it to fit maybe not to sure on this one .