Scott, looks like a solid car, but yes, you have your work cut out for you. This a great board, but mostly for the 95-99 Riviera. The very best place for you to be is http://v8buick.com/index.php With over 44,000 members worlwide, and WAY MORE traffic, V8 is where you will find the most resources for the 60's and 70's Buicks. If you have any questions about the engine, I can help you with that.
Does the switch pitch transmission still work?
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98 Riviera SC3800 All stock except gutted air box.
1970 Buick GS455 Stage1, TSP built 470BBB, 602HP/589TQ
Best MPH, 116.06 MPH, Best ET, 11.54
https://www.youtube.com/watch?v=UHCda-t_Jls
https://www.youtube.com/watch?v=sfT2tEO4XcU