Brokesmoke,your truck isn't black is it?Seen one this morning on Red Bank Rd.
Lots of companies use other peoples parts on their builds.It's much easier to do it that way for time wise.Diesel Addiction was at Rockingham Dragway this past July 26 when I was there.They seem to be some good folks when I talked to them.LionHeart Diesel doesn't custom build anything I know of,just do repairs and installs on diesels.They do alot of 6.0 PSD work,but take on anything.They have I quote "a 1000hp Cummins 24V" shop truck that the owner has,he's not a mechanic though.Eric Driggers is there mechanic.
Also,why not just go to a compound set up now?Sell the 67mm.Go with a 63mm over a 75-78mm.A 72mm work kinda suck for every day use.Yes,tighting the turbine housing would help but would choke it up in higher rpms.That being said.Stay with a single and run a BD spool flange.The turbine housing would need to be divided on the turbo.This would allow you to run a large A/R turbine but spool it like a small housing.The spool valve flange blocks off one opening on the turbine inlet till set boost opens the valve solnoid.This would allow you to run an 80mm if you wanted to

.Just a thought for you.
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1964 Impala 468BBC,T350 transbrake,4.30 9",10 point and 10.5 M/T's
1996 F250 4X4 12V Cummins,compound turbo 63mm over 75mm,cam,520cc pump,full billet 4R100 563hp&936ft.lbs w/a bad fuel pump and on a dynojet...just an old hunting truck