I look thru my "Boat Mfg. Codes" and didn't find any DeltaCraft listed .. or the ZLE code ?
But remember I also couldn't find the Swiftsure code ..
Will be interesting to see how they built your boat, some early CVX's had fuel tank running front to back and newer versions running side to side. Not sure but I've been told that older versions had a small piece of transom wood and latter versions had full width wood that was tabbed and glassed better.
My foam under floor and in stern boxes was dry, but wood floor under splash well, even though coated with resin, was rotted and transom wood behind left side was so bad (rotted) that I removed it with my fingers.
The mileage we get on the river run was 50% cruising (30 to 40 mph) 35% full or almost full throttle and 15% no wake / idling.
If you were pulling kids around on a tube all day at 30 mph you would most likely get much better MPG.
1982 was first year for prop rated 115 HP Merc / Mariner's and with some set up and prop testing get you mid 50's pretty easily.
I'm getting 53 to 54 MPH / GPS with my CV16 / 1989 115 HP Mariner and Dave's get a few mph more with his CVX16 / Johnson 115 HP.
Your bolt hole's in transom will be different from the Mariner to the 75 HP OMC motor.
This build still has some pictures ..
http://www.classicglastron.com/phpbb/viewtopic.php?f=34&t=6642