Dougs headers

Hi guys! Read all the threads on headers, but I really have 2 important questions before I order......make that 3.

1. Am I a bit anal, or is it ok to go to the small oil filter that Dougs require?

2. How is sparkplug access with Dougs?

3. Do Doug's capture your oilpan like the TTI's?

These headers will be going on a 71 Demon 340 with 4 speed and power steering, factory oil pan.