No disagreeing that the 4BT makes a great swap, but define reasonable and patient...........
I see complete 4bt powered step vans go for around $4k. On eBay, you can get a complete engine on a pallet for $3k......but that's a bit risky IMO. Like anything else......a deal may come along tomorrow......or 6 months from now.....I bought a complete step van from a plumber 30 miles from my house for $2k...... He had no idea the 4bt had any value.