Carby ? Hain ?
2001 EXi has EFi yaar, I dont think you have carby ... im pretty sure.
When you are starting is there a Yellow light in the dash ? Thats the engine check light and it means you have EFi.
All engine swaps will need mount change.
D15B 3Stage VTEC 130hp wala is better to buy than D16 ... more econnomy more power ...
Wiring main ... ECU wiring saath lo with engine ... body wiring hojaigee araam sey ... cluster change karna paraiga I think prolly for VSS to activate VTEC.