First, the engine swap is a complex process and requires a lot of time and money. It is important to make sure that you have the necessary skills and resources before you start the project.
Second, the B16 engine is a lot heavier than the original CRX engine, so you will need to upgrade the car's suspension and brakes to compensate for the added weight.
Finally, the B16 engine will also make the CRX a lot more fuel-efficient. You need to compare the car's fuel efficiency before and after the engine swap to see if the tradeoff is worth it for you.
If you are up for the challenge, swapping a B16 engine into your 1985 Honda CRX can be a great way to improve the performance and enjoyability of the car.