I've been high and low on the internet, and I can't really find a definitive answer. So, I'll lay it out here. I have a 73 fury, and I have a 400 that I am planning on 4 to 500 ft lbs of torque. I also have a 518 I was planning on using in my 71, but I think considering how nice and decently original that car is I am going to put one of my 727 stash in it, hooked up to a warm 360 magnum. My 73 also needs an engine, and I have a basically brand new 400 that will probably get a torque cam and maybe some higher compression pistons to fix the 8 to 1 problem. I would like to set this car up as follows: 4 to 500 ft lbs at the flywheel, split the difference at 450 for a round figure 4:11 or 4:56 final drive Using stock rockers in engine and possibly a/c so no high rpm here Possibly the Holley sniper efi with cable trans link Jvx(I think?) Adapter kit to hook a 518 to a big block Possibly a shift kit I'm not looking for speed or a race engine, I just want the car to swiftly accelerate with some semblance of fuel economy. I would really like to have the rear gear short, as it would help with the acceleration. With overdrive, it would basically be turning low 3.xx or high 2.xx engine speed with a 1 to 1 and that's exactly what I want. I'm not towing, and I'm not flooring it in overdrive. Will a stock 46rh live with a shift kit? Or am I looking at a hopped up 700r4? It's cheaper to buy a ready made 700r4 than it is to have a 46rh built it seems.