How far from Charlotte are these cars? Hard to tell value without looking at them in person or from pictures. The YU code is used on 69-71 350's but is also the block code for 74-75 455's also. The engine size should be embossee on the lower engine block just above the oil pan on the drivers side and that would tell you what engine it is. A numbers matching car is worth more as long as the block hasn't been restamped (a common practice these days) and sometimes rust issue can be remedied without being much of an issue.
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1971 GTO,72 400, stock bottom end, 670 heads, Lunati BMII cam, headers, iron intake Q-jet, four speed. Best 60 ft 1.806in 2004. Best 1/8th mile e.t. 8.46 with 3.55 open rear
85 Grand Prix, 70 400, casting 62 heads stock rebuild, Turbo 350 trans 78 800 cfm Q-jet modified as per Cliff Ruggles book.
87 F350 6.9 4 speed dually
A poor man has poor ways.
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