I have a Škoda octavia GLX MK1 TDI and i was wondering if a engine like a 2jz, 1jz or maybe some volkswagen VR6 would fit.

The VR6 engine fits. Someone has just done a conversion on their 4x4. It’s a lot of work and you really need to know what you’re doing. I fear that if you’re already asking, then it maybe not for you.

This picture and car is owned by Carl.

2.8 vr6 out of golf mk4 would be the best option,but it's the easyest to find a complete golf and swap everything out of it in your car.

1 hour ago, taptap said:

some volkswagen VR6 would fit

Physically yes, but you'n need to change the engine, gearbox, EMS and fuel system.

11 hours ago, KenONeill said:

Physically yes, but you'n need to change the engine, gearbox, EMS and fuel system.

+ driveshafts,and depending on engine he has now,probably gearshift linkage and clutch slave cylinder with hydraulic line...if he has a/c and wants to keep it he needs lower a/c pipe...he needs complete donor car.

and instrument cluster...

 

be a whole lot easier just find a good vr6 for sale...