[washington blue]

Just wondering why you need an overdrive so bad? I can almost guarantee you that the 283 will hate the overdrive. I have a 700r4 in my model A and it weighs 2700 pounds and it has 4.11 rear gears and the over-drive 4th gear is useless unless I am driving 70mph or faster. I have a bigger engine with a cam and it does not run really well below 2200 rpm just like a 283 doesn't. You have points and a vacuum advance to consider and carb vacuum for flow and advance also. Most of these transmissions have a lock up torque converter and if you run the engine below lock up it makes a lot of heat. You are going to run Corvette suspension so why not spend 1500 bucks and get a 5.3 with matching trans and computer and gas pedal from a 2005 chevy pu, then just get the anti theft stuff off the computer and drive it, your gas mileage will be great, better performance too, good luck.