So, if this engine is to be run on the street, these wouldn't be the ones to run. Wise is he who looks at the description and recommended usage of the part before purchasing.
While the snap ring is a good idea, many of these lifters are short travel lifters, like the Comp 867-16, and as such require adjustable rocker arms because the recommended lifter preload is .000-.010".
If you do not have an adjustable valve train it would be best to purchase a stock type lifter and just make sure you break in the cam properly. I've used these several times with good results.
http://www.summitracing.com/parts/sum-ht2011/overview/