Ok, so i talked to the guy in Iowa with the toppers. They do not have one for the R89 side post, but have been trying to get that done.
He made the point, and its a good one, that a good chunk of 70Zs depending on build date, would have come with a top post battery. So I guess I will go that route, a modern delco with a topper and keep my side post for any serious or judged shows. I also am going to convert my other pontiacs to Delcos and toppers (R59s). Although my collection is all hooked up to a ten bank battery tender, the repops just don;t do it. So I will do the same thing, save my acid R59s for showing and judging and do the toppers for my personal use.
I just put in the correct starter for my 69 TA and I still don;t have enough crank on hot starting to turn the starter strongly enough with my repop R59. I hope this solves some of my problems. It is extremely important for me to pick a ride and rip it whenever i get the itch.
Thanks,
JOHN