I have a home made one but it requires the transmission to be mated to the engine. No longer have the aluminum radiator but do have a 26 inch out of a 71 Satellite. Also i got rid of the wood holding up the radiator and made a metal one for it.
Its very crude but does the job. Used it to break in my cam. It can also be used as just an engine cradle. As in the fist picture.