I've not been on the forum of late.
#1 - Lsp3rd1982 - stop the swearing and the attacks or you'll be banned. It's not acceptable on this forum. From your posts, you still have a lot to learn about 1st gens.
As I've told the seller, the car is uncommon. L65 with a powerglide and 12-bolt.
Most buyers who paid the $20 for the L65 also paid the $25 for the better trans (TH350). The base engines often had the powerglide, not so with the optional engines. The 12-bolt was just a lucky substitution - there probably was a supply issue in this timeframe.
The L65 was a low-po engine, one step up from the 307. Good engine, but not a powerhouse, so that rant about it is off-base.
The 'rarity' of the car would be a conversation topic at a car show. Doubt it would show in the value other than the 12-bolt value. I highly doubt anyone would restore the car back to original. Most buyers would be after the body and axle and may not use the original engine, IMO.
Personally, I'd use the original block, build it like a L48 with a 200-4R trans.