Dlask doesn't "build" M14 rifles.
They do barrel shortening and basic stuff, but I've dealt with them for near 20 years and never seen the "build" or source parts for a customers m14. In fact I think most real m14 work got referred to me up until I closed the shop early this year. They did for a while offer RWB oprods and more recently, their gas lock sight.
When I was building these rifles, the basic rate for a "build" was in the 325.00 range and that included trigger work and gas system unitizing.
Extras to that would have been fitting GI type bolts, chamber reaming on match barrels ect.
Right now, your best bet is to get ahold of Tac Ord and get a quote from Casey