Greetings. I finally bought an FJ, after owning a series 80 for 24 years since new, and putting 245,000 miles on it. The FJ has been restored, but still has original 1F engine and tranny. I believe most people prefer stock, as do I, but this one came along, and I preferred it over a project for my into to FJ. Are these beasts a pain to try to return to stock after heavy mods?