how bad is a bus beam to replace, i t looked like it might bolt though the body under the seats?

Not hard.  you have to undo the shift rod that passes through the beam.  unbolts, slides down and out....

i think this is a 70 bus, the owner found a beam from a 71 but the guy told him he would need different wheels, i know little about the buses, woul it fit?

this is joe's bus, i think it is a 70, then that would make putting the 71 beam a little akward to run 5 lug on the back and 4 on the front

it is the bus in the picture that i put the engine in, so i will tell him to keep looking

I sold my 72 Beam to somebody (Mike?) a few months back.  I have a shell of a bus over at Kyle's place that still has the front beam bolted to it . . . I think it's a 68 or 69, but it might be a 70 or 71.  I think the beam is O.K., but I haven't looked at it real close.  I'll be out of town until Sunday night . . . If you are interested in it, I'll check it out one day next week and find out for sure what year and the condition.