[chopper]

Your 427 should have solid lifters, unless it's one of the relatively uncommon '68 engines which were drilled for the hydraulic lifters.

My Crane cam came with instructions for adjusting the valves to 0.022 inches HOT or 0.025 inches COLD. This measurement assumes you have stock (cast iron) cylinder heads. It's my understanding that most mechanics recommend adjusting the valves HOT since this sets the clearance at the proper gap for actual running conditions. Having said that, I tried it both ways and found that the two methods resulted in a difference of less than 0.002 inches.

If you are running aluminum heads; this will make a difference because the aluminum heads expand more than iron heads when they heat up, resulting in an increased clearance. I have Edelbrock aluminum heads on my car and I reduced the clearances from 0.022 inches HOT to 0.014 inches HOT under directions from the builder and Edelbrock.