update.............
finally figured out how to make a CHEAP hot box or oven to preheat my head and reheat after welding on the cheap............
rounded up a 120 lb metal grease barrel which axle grease came in. gonna cut it to length of head plus 2 inchs of the length of my 250 head, then weld a thin metal end cap over the open end. then split the barrel length wise, weld 2 cheap hinges so haves can be rejoined opening n closing. use 1/2 in rebar to make a grate inside to hold head. cut a few air holes so charcoal will burn. fill it with large bag of charcoal, put some alum. foil on grate to keep head clean. screw in a couple eye bolts in head to pick up head when hot, use cherry picker. gonna do a dry run on a cracked head to try it out. also gonna have a friend use a propane weed burner on head while head is out during brazing. thoughts............