Hi Roger,
Check
this page. Answer to question 1 is yes: MD will fit MC and even older SR-type lenses.
Question 2: Non MC means non-meter-coupling and relates to the older SR-bayonett type lens.
The problem with the Pentax adaptor is: focus to infinity can be achieved only by ading glass element to the setup. This degrades the optical image quality of the original lens in severe ways and is IMO not worth it. Better way for you to go would be to investigate the older
Takumars by Asahi Opt. Co.
Cheers,
D.