New to old SeaCraft ownership, livewell question

[thumper]

I'm the very proud owner of a new-to-me (yet seven years older than I) 1976 18 center console.

The boat seems to be in extremely good shape, but it's got a little way to go before it's the fishing machine it will become.

First and foremost is a decent livewell setup. It's got the original swingback seat box. I'm not opposed to going with a leaning post and a removable livewell setup, but I'm wondering if there's any way to add a decent (15-20+ gallon) size livewell somewhere else in the boat without upsetting the balance.

I'm sure this will be the first of many questions I've got for the CSC crew an I'm grateful to anyone who had the patience to read this first post and has some insight.