@Account Closed $8K sounds realistic on a house of that size assuming there is access and room to work.
You can likely do a budget rehab including foundation work on a house of that square footage for $40K in South Texas. I just leveled and raised a 1,000 sq ft home in Central Texas for $6K. It took a crew of guys a Saturday to do it. This included new 4x6 beams and we raised the house a total of 8 inches to allow for access for the remodel and future crawlspace access. I will probably spend $55,000 on this home when all is said and done and will be pretty much totally new with the exception of things like siding, a few interior doors, etc...
Since this is your first go, $40k could spiral much higher if you aren't careful. Things like trim, doors, cabinets, etc... really add up once you get past the obvious major systems and mechanicals.
Word of advice - don't trust any numbers from the wholesaler. I am not saying they are being dishonest on purposes but most don't have any idea on rehab costs.
Best of luck!