Welcome to CHR, Quincy. Down in your area there were a bunch of old big blocks bought for irrigation pump service - lots of low end torque, set on an engine stand in a field coupled to a big pump, and run on a governor at their power/efficiency point for hours at a time, pumping water for the cotton crop. I remember walking into a Chevy dealer around 1965 to see a brand new 409 sitting there on a stand at the service bay looking grand, but with a little two barrel carb sitting atop the intake. I got excited, and an older farmer said, "He!! boy, it's just a damned irrigation engine!"

I'd pull the pan and see what you have for a bottom end, two bolt mains or four, and then maybe get some casting numbers and check them against the lists on line, like maybe this one Ford FE Engine Block Casting Numbers - FORDification.com Like Mike says, the key is getting your plan, and then working the plan without much deviation. Changes almost always cost money, and sometimes lots of money. You're most welcome to kick things around here, but you'll find a bunch of focused Cobra guys over on Club Cobra, run by the same guy (Brent Mills) with the same kind of rules.

Good luck with your Cobra!