Did you check the head for straightness and cracks? That's more common than block deck warp.
Sounds to me that you've bought a new head for nothing. Not many places an engine [diesel] can leak coolant and as you say burn it. I suggest your not burning it but leaking it. 750 to 1000 miles to loose a pint of coolant could take a long time to drive that distance with coolant under operating pressure. Only a pin hole neccessary. I had a leak facing engine in the waterpump to back of engine 's' hose. It left no residue and only leaked when driving in the form of a fine steam jet. Always shut off before totally depressurising coolant. I cannot remember how I found it. I seem to recall I'd given up and happened across it by accident. 1 US baby pint is only 16 fluid ounces isn't it? Leakin at less than 1cc per 2 miles....
I order a short block from Parts Place for $1295. They said it would take about 3 weeks, I gave them a deposit of $500. Hope I didn't make a big mistake?