$50 ? Really, you should have priced them before they were reproduced, at least double. Anyway, you could try to find used on eBaybut I'd spend $50 and be good for the next 45 years. Anyway the conversion is more and requires drilling and tapping the bosses on the side of the carb. A little scary but I've done it, to run an AVS on a non stock intake manifold. I'd never consider it for an OEM HP AVS on a stock intake.