looking at getting a spare 351 cleveland for my XBGT. It has the original untouched motor in it, but has nearly 300,000kms on it. Still runs fine. Thinking of lifting it out and storing it, and putting in a replacement. Found a GJ23 351 (77 xc500 sedan motor) D2AE CA block. story goes it was recoed and went about 50kms and guy hit a tree!! Been sitting for 3years, then next guy bought it but never used it. Been on an engine stand for 4years. Exhaust ports look really clean but not blocked off. Same as the intake. He wants $3500 for it, Turns over ok . does this seem like a fair deal?? I know I could just rebuild my original for that money, and expect to strip this one and prob spend 3 on it, to make sure its reliable. bit out of touch on these motors, Anybody help??