A Merc 400 would have a shift-able lower unit, not a Direct Reversing model.
These motors came with or without electric start; if you are able to pull the "wrap" off of the powerhead, it'll be readily apparent if there's a starter.
If the flywheel has no teeth on its circumference, and no starter is mounted on the Stbd side of the engine, you're gonna be pulling to start.
Not that bad of a thing on these, they are very easy to start. I ran an entire season pull-starting my $25.00 MK58A on an old wooden ski boat. It always started with a few pulls on the recoil starter, and ran flawlessly.
They really are good old motors and the Inline Four was one of the best designs Merc ever built.
ed-mc Thanks for the info. It will make it easy to i.d. I really don't need another boat,but its hard to pass up a good deal.It all depends on how many bidders there are,and how bad they want it.Thanks again.