What are the best mods for a bone stock '91 5.0 with AOD? I know that changing the gears are a popular choice, but I'm planning on dropping in a T5 at some point, so I don't think I'll bother with the gears until then. What are the most effcient mods in terms of cost and performance for a stock 5.0? Will longtube headers be able to clear the automatic transmission? Thanks.