Engine & Internal - D15b1 & D15b2

First of all, hi everyone. I'm new here.

I have a '90 civic with D15b1 4spd manualin need of a motor.
I got D15b2 block with all internal (needs to be assembled) but the head.
Could I use D15b1 head?
Also, the crank of the D15b2 doesn't look good so I'm thinking about using 15b1 crank.
Is it OK?

What's the difference between 15b1 & b2?

Anything I need to know before I start build the motor?

I would appreciate your help.

All components are compatible between those two. Just make sure you have the right ECU for the right head.

Thank you for the information.

Does anyone know where I can get build spec (torque, etc.)?

I would appreciate your help.

dont even bother with the ecu ......dual point sucks major balls. convert the car to mpfi and you will notice a very nice gain across the powerband. and as far as tq specs i would recomend buying a repair manual for that. but you can always contact honda for that info as well.