If you want to go for drag 1JZ turbo, RB25 is the way to go. If you want to fly go for 2JZ turbo or RB26, that's what I can understand. Comparing these to a S50/S52 block is too much high maintenance for an old car, I agree as well.
I guess people who want more pickup and acceleration go for JDM conversions. The reason for this is too much hp and torque are available at:
- Cheaper maintenance
- Lower fuel consumption
- Low road tax
- However quality of the car is sacrificed during conversion.
I have seen a few JDM converted E36 selling on mudah as well. Also came across a E39 2JZ turbo, monster. But then again putting such an engines effect the chassis or body of the UDM?