318 4bbl Questions

Howdy folks,
A little on the cold side today, so I thought I would spend a little time inside planning and (dangerously) thinkin'...
First, anyone have an LD4B they want to sell? What's a decent price if I can find one?
Next, a little more technical. Sometimes, the more I read the more confused I become. I have read just about every post on the forum that deals with 318 and 4bbl intakes as well as any link that they may lead to. I think I have a general grasp of the issue with using 360 heads and/or an intake manifold with larger ports for a 360. I guess my question is why did Chrysler use that set up - a 318 with 360 heads and intake - on the later 80's cop cars? Surely Chrysler could have made a separate manifold for that application?
Last, using a new Edlebrock Performer intake - if I end up going that route - the applications are listed as 318/360, wouldn't that have the larger ports?
Thanks for any info,
C