Originally, the Hot Rods were advertised as no tune. You could put them in, but you'd have idle dips and little driveability quirks, as well as a mediocre performance increase. As long as you get the right person to dial in the cams who has worked with them alot, the idle/driveability should be perfect and the power increase will be alot better. It's all in how you dial in VCT.
We do probably sell and tune 10-20 sets of Hot Rod cams each week this time of year, and are extremely familiar with those cams. If you have absolutely any questions about the calibration, the performance, the driveability, let me know!