2 questions about engine placement (B engine)

Just lineup your transmission to your tranny mount while supporting the motor then use the other measurements to get the block in the right position. Just make sure you Don't tighten the trans bolts then try to move the engine around, or something bad may happen.....:shock:
You also might want to get your headers and then trial fit them when you find your motor position, just to make sure everything fits fine before you make your motor mounts.