Zookeeper / Toomanytocount has a 500 going into a 'burb.
Actually it's the baby mtr, a late 70's 425 Caddy mtr between the frame rails of a S10 frame that the bus sits on.
A guy on the HAMB as an early Cadillac motor in a '54 or '55 1st GMC running an Eldorado tri-power from the 50's. Look there for posts by NONAME (yes, that's his user name).
NONAME's truck pic's