Im building a B20B with a B16A2 head. I'm finished except for that black box that goes on the back of the block. On the B16, there's a hole in the block that this box fits into, but on the B20, there's no such hole, or mounting places. Anyone that's done this, can you let me know what you've done to get around this. Also, the crank on the B20 does not have that extra gear on the crank gear for the crank position sensor. How do you get that off the B16? Do you pry it off, or is there an easier way? I thought maybe a steering wheel puller, but I don't think there's room to get it behind the gear. Thanks in advance for everyones help!