If anyone has any information that can help me with my swap please let me know
here's what i got 2000 b20z and complete 91 ls drivetrain i already know mostly what i need except for the intake manfold and wiring

 

The B20 is really just an LS motor with 84.5mm bores. So as such, this swap is really not alot different from an LS swap in terms of what needs to be done. There are a few differences, thoigh. As for the B20, you basically use just the B20 longblock. Most everything else is from the LS changeover. This includes the transmission, driver and transmission side bracket, intake manifold, and ECU. Also, if you are hellbent on using the inferior pre-1992 LS ECU, you will need to use a 1990-1991 LS distributer. But if you use a 1992+ ECU, you can use the B20 distributer. And you might as well, since it is newer and less likely to be bad in some way. The rest of the swap (as I said) is the same as an LS swap.