Lurking here alot for information, working on a 5.3 swap into my 64. This is a great source for assistance, inspiration and ideas. Went through the oil pan search and came across a good website that shows good images of these pans. GMpartsdirect.com, type in an oil pan part number in the search and the majority of them have good images with dimensions. It also has the parts associated with it, windage tray, pickup tube, etc.. Also shows application if you want to visit your local salvage yard or search on ebay. I attached some documents showing a few hopefully it comes out alright.
I'm sure there are many other part numbers out there, these are the ones i was looking at, feel free to throw more part numbers at this.
Thanks to all those sharing their knowledge on here it really helps.
Attachments did not work, tried to make it easy with pictures.
gmpartsdirect.com and search these numbers:
http://www.gmpartsdirect.com/
12628771
12631828
12640748
12581209 Front sump, not much use to us.
19212593 Go to Summit for an image with dimensions for this one.
http://www.summitracing.com/parts/nal-19212593
302-1 and 302-2 Holley swap pans, Holley.com for dimensions.
https://www.holley.com/products/acce...ns/parts/302-1
https://www.holley.com/products/acce...ns/parts/302-2
LS1Tech has a great thread also.
http://ls1tech.com/forums/conversion...-oil-pans.html