I don't think anyone is clamoring for a 326 2bbl. I think the resale value is only compromised if the car was originaly a 400, an HO, or a Sprint. Just my opinion. When I bought my 1969, I knew it had a 1968 350. I didn't care because I knew I wasn't going to leave it as-is. I wouldn't have paid any more for the correct 350 2bbl.