Thanks for all your help. Other symptoms that have developed are: Oil extremely black, although I changed it last week, tremendous loss of  power and lots of clanking and chattering noise when accelerating. The car is parked and It is definitely time for a rebuild.
 
The engine is a 350 backed by a TH350. My easiest choice would probably be to go with a short block so I can still use my original heads and Thorley headers. But I'm thinking maybe drop in a 455/TH400 short tail instead.
Comments would be really appreciated. Chris, Steve ( or anyone else feel free to chime in)
what is available?
Tia,
 
Bruce
72 Cutlass Conv.
56 Mercedes 190SL Conv.
05 Caddy STS
04 Caddy SRX

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