Check out Traditional Rod & Kulture mag Issue #13 for Bob Licks Olds powered 40 which also appears in one of the Hop Up books, #8. Also, do a search on Squeak Bells Olds 40 here.
Send me your 40 and I'll put my olds in it and send you a picture. Matter of fact if you got a '40 coupe I'll trade you my '53 Stude for it and then I won't have to remove the motor and send it back to you. Very traditional engine swap they fit well and go like stink. Good choice if you decide to do it.