No. The Engineering Department has copies of the Town's Assessors plans which will show the general lot configuartion and area of the parcel. It will not show buildings or other improvements on the parcel. A private land surveyor is required to perform a Plot Plan for Building permits.
FEMA Flood Maps can be obtained on-line at msc.fema.gov. The Engineering Department does have copies of the FEMA maps and can assist you with questions you may have but does not do Elevation Certifications.
Deeds are filed at the Norfolk County Registry of Deeds in Dedham - norfolkdeeds.org. The Assessors Dept. can assist you in getting the file reference (Book/Page) of your deed.