I want to build a NA motor for my 73 240z. Of course I am on a budget and not only that, I came from the Honda community with 13 years of building NA motor knowledge and experience. So I'm accustomed to fast natural aspirated Honda's. But old skool Datsun's is entirely new to me. I am seeking for suggestions on the best NA motor to build. Reading some stuff about the L28 blocks, sticking with the same Head and I don't know what else. Pros, please enlighten me and give me pro advice...thanks a million!!!