As I suspected, someone out there had the right answer. Thank you all, especially rmarzman. To bring you all up to date, the car is a federal '84 (should have told you that in the first place) and the engine is a federal '85.

So - for clarification, I should be able to plug new engine in and leave theelectronic rack sensor unplugged? Easier than I thought - seller of '85 engine was cautioning me that there were electronic differences between the '84 and '85 IPs and I was just checking.

By the way rmarzman - those charts you posted are priceless. Many thanks!!