Chevy 250 swap into 53 pickup

[abranz]

Hello, I've had my 53 for nearly 40yrs and the 235 has cracked. Engine shops in Spokane are not very interested in it and the prices they quote me ($3000)make me shy away also. I've looked for used, running 235's but they range from 700-1200 with zero documentation on miles, maintenance, or rebuild histories. Basically buying a core for that amount doesn't do much for me either. They could be cracked also for all I know or have other issues.
I have a 69 1/2 ton with a 250, manual 4 speed that's complete. I am interested in having the 250 rebuilt for my 53 but I've read for days that it may be too long and I will need custom engine side and transmission mounts. How hard of a swap is this? I can't see how I can move my radiator any further forward with the latch cowling there.
I've obviously enjoyed the truck and would like to put my efforts toward a reliable engine I can get parts for easily without costing a body part. Any help or suggestions very appreciated. Anthony