The vac cans are relatively easy to swap out. First couple times are the hardest, like most things.
Yes it might.
Are you running mechanical or electric fans now? In my opinion, the mechanical fans will generally get the best cooling. I think in part because the shrouding for electrics blocks too much of the airflow at speed. With mechanical, a hood seal and fan shroud help a lot at idle. I realize with your car, there just may not be room. So this may all be impractical blather.
At 2800 to 3000 rpm it would be about right for a typical iron headed LA. Click that link in my earlier post. Use the Direct Connection recommendations reprinted there. If its too small to read let me know. Next post we can look specifically at the timing curve you measured.