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Streets...a cammer in a 68 coupe???? Really or you leg pullin??
Legacy, if you see ribs on the side it's a 70's service block. No casting number just date code. When you locate the date code...

Are there vertical ribs on the sides of the block? If so it would be a service replacement block and would not have casting numbers but would have a date code. It's kind of hard to see the date code...

The timing cover should have a number with a circle of dots around it also. This is the date code and will help tell what year the cover is anyway. The number ex: 68 inside the dots is the year cast....