In 1978, Egg harbor replaced the 38 with the 40 - stretched it to get more cockpit space.
Maybe pacemaker used the hull mold from 78 on
If it's that 38 mold, the engine room height is very low. I heard, but don't know for sure, that they were using a slant 671.
Make sure whatever surveyor you use has experience with surveying wood boats. Although the hull if fg, there's a lot of bare wood/fabric and resin over wood. At some point, egg harbor started to mold a fg flybridge, but I think that was well after 1980.
You might find more information at the eggharborowners site.