1959 holiday sedan, which engine fit ??

hi, I am looking for a new engine for my 1959 98 holiday sedan vehicle, 394 cui, vin 599C06608, hydromatic
Does anybody know which engine (chevi) will fit best??

My engine gets emediatley hot (I think after the long cold winter there is a crack in my cylinder head), new cylinder heads I can´t find at least :-(

Next problem is, I live in Europe, so nobody is able to help me with the problem!!

Thanks
Thomas

Not a easy project will need to fabricate motor mounts and will probably have to swap out transmission bell housing. I would think you could go with a Chevy 350 as it seams a lot of after market products are made for it. Also should be available in your local area. There will be some modifications and tweaking along the way. And is not a project for the beginner. But basically if enough effort and fabrication is toss in it can be done. I would search the web to see if any one else has done it and what they had to do for a start. then decide.