ok i have a 1970 510 2 door and it came with a L20b motor but i dont know what year it is. I was hopeing you guys can tell me how to find out and i was wondering about boreing it 30 over if i would have to change anything else . Im about to strip it down and rebuild it but was also thinking of getting it bored . And if you guys now some other mods i can make and the price it would be appreciated thanks