GM Bellhousing... working on the rest.

no the bellhousing on 99 is made like a ford starter mounts to bellhousing and not to motor and it has a full bellhousing instead of open on bottom

No, the engine is not the transmission bellhousing. The bellhousing is a separate piece all together.

Call a GM dealership and have the VIN handy.

once you have the bellhousing,any gm trans will bolt up. camaro and firebird trans will require special crossmember.they mount at an angle.