You might want to reconsider going to the expense of installing hardened valve seats??? headscratch I think Jerry (Hotrod Lincoln) will offer some previously provided "great" recommendations on why hardened valve seats aren't really necessary in respect to your 235.

Jerry - Care to offer the new guy some wisdom? smile

~ Dan
1951 Chevy 3 window 3100
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"My Grandpa Carl's Truck and How it Became Mine"
1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver)
US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)