Hughes Engines specializes in small-block Chrysler performance, and we spoke with a couple of the company's tech guys on the phone. They recommended using a shaft mount-style rocker arm system but stressed the importance of setting up the valvetrain properly. Though the cost is initially higher, the best bet is to use adjustable rocker arms and custom-length pushrods. They'll lend you a kit to set all your angles correctly and measure for the right pushrod length. Send the kit back and they'll send you a set of pushrods. They spec'd out a stout 480hp engine for about $5,000, and that's the build we priced out in the chart at the end of the article. If you prefer to cut right to the chase, you can buy a complete engine from them.