Originally Posted by dasyhard
Thank you for this valuable information F-Bird, but if you take a look at my attached photos, there is a bracket that sits tight against my starter after I removed the starter. Please view it and let me know if this brace serves its purpose. If not, than I will take your advice and go with the Eckler's starter plate.
Danchuck also sells the adapter plate, check to see who has the better deal on them. More info on the adapter plate and starters in general here
If the cracked hole has good metal, drill/tap it and use a stud, not another bolt. That will put less stress on the hole and might last a long time.
The starter brace is shown below; it bolts to the back of the starter (the end towards the front of the vehicle, in other words) and connects it to the engine block. It's made for a stock type starter. Aftermarket mini starters generally won't work w/the stock brace.
One other option for a starter is a factory permanent magnet-type starter. Smaller, but still w/good power. Being lighter, it puts less stress on the mounting area. IIRC, someone wrote that ordering a starter for a 2000 4.3L S-10 will get you one that fits a SBC w/a 153T flexplate/flywheel.