TA performance offers head bolts, and the "modern" neoprene rear seal you want is the one that is the OEM seal for the Buick V6.
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Ed Raner
ROA #279
Heartland Regional Coordinator (Kansas City area)
1963 Riviera - Black w/ white leather
1964 Riviera mild custom
1984 Riviera - Black w/ sand leather
1985 Riviera - Dark Blue (stealth mode)
Some days you might have to be the statue, but other days you get to be the pigeon.