Bakerlite: Have you tried them (rhoades lifters)?
Ask someone who has tried them if they made a difference.
All I'm recommending is to get the proper cam for what you want, and then get the Rhoades lifters to get more driveability on the street with it. Ask people who have tried them and don't let one hater steer you away.
Do your homework. Go check their website and read about them. Start a post on who has used rhoades lifters and how they liked them. They've worked for me and that's why I recommend them.