Can i use this trans crossmember?

[richards72chevy]

Im getting ready to drop the engine and trans in my 66.Ive searched the other threads and every body uses the crossmember that bolts into the frame from inside on both sides.Mine just just has the bolts like this on one side then the other side bolts on the outside of the frame.Can I still use this?I also noticed on the frame there is some holes that look like they were there for the transmission if the truck had been an automatic.Did the factory put theses holes for an automatic?Can I use them or am I better off drlling my own holes?