What do you guys think is a reasonable price for a used 12a.say with medium miles (130-150 thousand) ? What if its modded with like a RB header and a webber carb?

 

maybe 500 IMO depending on the carb

 

I would second the 500$ if i could hear it run. If not, and motor was already pulled, I would say about 150 to 200, cause you never know what condition it is in. Then again if i believe that I can trust the seller I might would go more.