Well, like I was saying in the other post, lets start with the free stuff (or almost free stuff).
1. Make sure there is no air in the system. Get the car on a slant, or jack the front end up so that the radiator cap is the highest point on the engine. Open the radiator cap (with the engine cool obviously). Warm the car up with the cap off. Get it hot enough to open the T-stat, see water running by, lightly rev the engine a little....do this for a few minutes after the T-stat opens (add water as needed)...this should get any air bubbles out of the system, and it's free.
2. I'm a fan of Water Wetter, usually good for at least a 10 degree drop (about 8 bucks).
3. Might want to look into a better water pump. I can't say for sure that is an issue because I ditched mine years ago before I built my stroker...but it probably won't hurt. Mine is a Milodon mechanical pump (about 80 bucks).
What oil filter are you using? I use to have low oil pressure with my motor too~ 15 hot at idle and ~50 above 2500 RPM (10-40 conventional oil). This might sound strange, but I switched oil filters to a Fram HP1 and now I have 25 hot at idle and 70 hot above 2500RPM....just something to try.
Totally unrelated, most strokers I have seen (mine included) like ~34° total timing...just food for thought.