Thanks to everyone for their responses.
This is a Rexhall Aerbus that we bought new, only has 29,000 and change
on it. Is in really good shape as far as the coach goes, indoors much
of the time. Never been hot and the OP has not changed since new. Always
run synthetic oil in it.
Has a driver side door but not sure the doghouse will let me pull it out
from the top, maybe with the heads removed, will have to do some
measuring if it comes to that. Don't think there is any way it could come
out the front.
Son-in-law is a mechanic but his shop is not set up for this operation,
he has had good luck with Jasper motors in a number of applications. He
is also a customer with O'Reilly's so might be able to work through them.
Will let you know when I find out anything.