Quick search for early '90s Pontiac Transport, brought up this listing on ebay:

http://www.ebay.com/itm/GM-DELCO-ECM...sories&vxp=mtr

Ludis's reference brings this up:

http://www.exatorq.com/ludis_obd1/c3xref.html#16149405

The '7730 was used on an early I4 application:

http://www.exatorq.com/ludis_obd1/p4xref.html#1227730