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Thitek Heads Question?

Im going to purchase a set of Thitek heads. Does anyone have any insight on all the options that they offer. Are they all worth the added expense or should I pick and choose from the list for the "Custom heads"? It's a loooong list;

Coated Titanium Valves
Copper Beryllium Valve Seats
Custom Port Design
Hollow Stem Valves
Inconel Valves
6 Bolt Head Pattern
1.550 Dual Solid Roller Springs
Steel Valve Guides
Steel Valve Guides w/Bronze Liner
11/32 Valves
50 or 55 Degree Valve Job
Additional Milling
Alternative Valve Lengths
Beehive or Dual Hyd Roller Valve Springs
Chamber Coatings
Taper Quench
Titanium Locks

I have a built 392 Twin Turbo w/Arrington 6.1 Heads (I'll be selling them shortly) that have Arrington Roller Rockers. I see that some of the options are either redundant or don't apply but I was wondering what would be a definite to choose and what would/could be optional to keep the costs down. Thanks in advance for any suggestions.

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Ok so I've been going back and forth with Craig from Thitek exchanging a bunch of info and I have to say his knowledge and response are first rate. Outstanding Customer Service! Will be pulling the trigger real soon. 

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