Looks like the back side of the cross member does angle down to form a low spot (notch). However, the first belt groove of the pulley/balancer still sits over the cross member leaving me no room. Will have to do some additional detective work.

Numbers on the motor tell me its a 72 Pontiac.

Engine Code YX/CO36223
Date Code: H251
Engine Casting#: 481988
Engine VIN#: 22P305020