the one at the back should go to the isv under the ht lead cover with on an obd1 .... the other one can be removed and a filter put on the pipe coming off the rocker cover and the hole on the air intake plugged up ....
the gargae i use is ver reasonable on prices and the mechainc is pretty dame good if i do say so my self would defo recmoned him to other memebers .......