Yes. The tappet block covers are just that: covers.
However, unless you're going to remove the gas tank, rockerboxes and pull the rocker arms to reuse your solid, nonadjustable pushrods, you'll have to cut the pushrods and replace them with adjustables. (Quick-install pushrods)
Screamin Eagle makes them. $145 a set. Comes with new upper pushrod tubes as well, which are shorter for adjustment.
It's a 2-3 hour job with a lift and bolt cutters for the old pushrods.
“Peter, arson is a serious crime. It's not like smuggling Oriental hookers into the country, in steel drums........” ~ Glenn Quagmire~