There is a little bit of interest.
Ok, so far the plan is to pull the nice 12A from the white '83 GSL and stick it in a silver '83 GSL that needs an engine. When it sells this will fund the 20B rebuild. In the mean time, I believe I have enough spare parts to build another 12A to similar specs and stick it in the blue car so I can at least drive it.
Does that sound like a lot of extra work? It's not really. I can sell this other 12A as well and make a little scratch for suspension upgrades or whatever. If it turns out as awesome as the 1st one, it will definitely be worth it for someone to buy. I know whomever gets the silver car will really love it.