If you can't find a crate motor you might just be able to piece one together from parts found amongst the membership here.
I have a set of new Destroyer heads, a set of slightly used cams with gears, a stock Destroyer transmssion, a set of rods and a set of 2006 stock cases that Scott could bore. If I'm not mistaken Scott has or had some new Destroyer cranks.
A little word to the wise regarding Destroyer motors. If you blow one up keep the old cases. Rumour has it without an engine serial number it's almost impossible to get a new set.