Where is Omicron Persia 8? If your car is a " big chunk of rust " you may want to look for a better car for a V8, unless there just isn't any where you're from.
I would go with an OD , stick or auto. If your only choices are a T350 or T400, I'd go with the T350. It's lighter, and shorter, and if down the line you want OD, a 200-r4 is the same size.