From what I hear the Toyosha MS142 in the 1030 and the MS150 in the 1035 are bolt-up identical. I have heard of at least one person who had a trashed engine in a 1030 use a 1035's engine to re-power.
Probably the best option would be to find a junked 1030 or 1035 with a working engine and swap. I see 1030s and 1035s "for parts" show up from time to time in my area.