At that price and in that shape I wouldn't count on ANYTHING being "good". No, 155K doesn't mean the head gasket's ever been redone, some people got lucky and made it as far as 200K before it went. Do a compression check, check for contaminated coolant and oil. Yes, check for diagnostic codes after going for a drive. Don't plan on your N/A being a donor for anything drive train related... A lot of it just won't work.
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