The next issue was pushrod length. With milled heads and the smaller base circle of the bigger cam, you always need to check it. We bolted on the rocker shafts and used a wire feeler gauge to check the preload of a pair of lifters resting on the base circle (that means both valves are closed) and found it to be about 0.040, which is OK. If the lifter preload is too much, you can cut thin spacers out of sheet aluminum or steel to put under the rocker shafts, or get custom pushrods. Our rocker geometry was pretty bad, but we didn't do anything about it.