With everyone in the world swapping to LS engines , the old SBC have gotten pretty reasonable. Don't get me wrong, I am all about keeping the 235 but if it's a matter of economics, you need to do what will bring the most at sell time.

I would at least open up the 235 and see what is going on, it may be as Otto suggests and just need a head gasket.

~ Craig
1958 Viking 4400
"The Book of Thor"
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1960 Chevrolet C10
"A Family Heirloom"
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'59 Apache 31, 327 V8 (0.030 over), Muncie M20 4 Speed, GM 10 Bolt Rear... long term project (30 years and counting)

If you don't like driving yourTruck, you won't drive yourTruck..| Living life in the SLOW lane