BillyBob
Here is the pump I used in my 23' stock well before my transom enclose. It worked great.
(Try to follow this

) I mounted it via the access port next to the livewell lid (port side). Inlet side was plumbed from a thru hull intake scoop & Seacock in the same access to the pump. The pump's outflow was plumbed thru the top sidewall of the tank into a 2-way valve (higher than the water level, the overfill drain hole) By lifting the livewell lid I could reach in and switch the valve. In one position it would shoot water down into the tank (180*). By switching the valve to the other position (90*), it would push water to the washdown outlet also plumbed thru the front (bow side) top of the tank access thru the battery deck hatch. The tank's overfill / drain would auto drain thru a screened PVC thru the transom (1/2" lower than the switching valve) Next using the old battery access hatch in front of the splashwell, I was able to drill a hole in the bottom (bow side) of the livewell and insert a small 300gph pump for tank pump out. The outflow was "T" into one of the the existing bilge pump out lines.
Short of abanding the existing livewell and using a stock bait tank, this system involves lots of plumbing and wiring etc. but it is the only solution you have utilizing the old confiure.
Sorry I don't have pics and this might seem confusing but PM me for futher info if needed [img]/forum/images/graemlins/tongue.gif[/img]
Click Here for pump specs------>
Shurflo Baitmaster Pro