Charlie - Here's a link to some photos of my 4-into-1 installation where I ran into intake tube problems.
http://tangodelta.smugmug.com/Airpla...48731551_UDmCe
I checked my old emails and Sue at Aero Sport Power helped me.
www.aerosportpower.com
Phone: (250) 376-2955
She was very good to work with and the intake pipes she sold me fit right first time!
My sump was from a IO-360-A1F6D (I think) 200 hp engine supposedly from a Cessna Cardinal. My cylinders etc. are parallel valve IO-360 cylinders, rods etc. All the accessories seem to be from the A1F6D
I would look up the receipt from Aeropower but the receipts file is in Illinois in storage and I'm in Texas. If someone wants to call Sue and give her my name she should be able to look up my order and get the part numbers. I ordered the pipes in July 2008.
This would be a lot easier than making spacers, and I'm not sure the spacers would have made everything fit up correctly. The spacers would probably be less expensive though.