Is this engine recoverable?

Yep. I thought about the V8 swap, but I'm still in high school and definitely don't have the time or money for all the necessary modifications.
Put some feelers out on the interwebs. Somebody out there has a running slant that they pulled for a V8. You may be able to get it dirt cheap to near free. Then its drop it in and go. Then if you want to do a V8 later on, you got a running driving car as you save up parts for a swap.

Rusty is right, the chevy guys got it easier, but transdapt and schumacher make slanty K frame to V8 mount swap kits making that K frame a non issue. The boneyards , as well as people all over the interwebs have small block transmissions for sale. Heck, find a running dodge van with the right engine and trans combo and pull it. Load the van full of scrap and get some money out of it when you scrap it.