Finding an oil pan shouldn't be a problem the fan shroud is a different story if you're looking for a factory 70 fan shroud get ready to pay $800-$1000 TA performance has a decent reproduction for I believe under $ 200.
I do stock the Aftermarket Shrouds IF you go that route. My price on them is $149.00 Plus Exact UPS Shipping. More info at https://www.diecastmusclecars.com/dcmbuick.htm (Engine Bay Section)
I’ve got an original fan shroud and may also have an oil pan. Send me a message if you are looking for an original fan shroud.