.
...in general, the tilting forward problem usually takes care of itself, when you match up both wheels as 700c.
I would shop around online and see what shows up as a 1" threadless headset these days, before I got too far down the road on this.
For a while, those were difficult to find. Threadless didn't really take off until steerers were going to 1 1/8". But they did make some.
The rake/trail thing is hard to predict. Your new fork might turn out to handle better (or worse), than the original. Try to stay as close as you can to the original. in terms of trail.
__________________