I don't have a ton to add, quite honestly. I just saw the name of the thread and was drawn in like a moth to flame.
The amount of fun I had running this and the weird, off-the-wall antics that my players did in the late 80's early 90's . . .
But since I'm here, I have to ask - why convert it? Its a pretty simple system that works nicely and if you are hot to play super spies, Spycraft is a good game as are nice mods for d20 Modern.
Of course, if you have a small enough group, the best spy game ever made was Victory Games' James Bond game. Of course it breaks down after about three players . . .