340 rear main choices- race motor

My Barracuda vintage race engine (7000 RPM 340 T/A block ) has a leaky rear main seal, so I have it on the engine stand, pan removed and ready to replace. The problem is, what to replace it with?

Timkin 5414 from Summit $44.97 (the most expensive, maybe)
Felpro BS 40245 from Summit $10.97 (Says "not intended for race applications".....)

Superformance SPF9340 from Mancini Racing, $26.95

Dvorak DVO 23340 "Red Seal" (no price listed on their website, but is probably $30-40)

http://dvorakmachine.com/rearmainseal.shtml

Amazon.com shows a Cometic C5683 for about $30 or so.

I am sure I can also just order something from NAPA, but I am unsure about the quality.

What says ye in A-Body race land? I am tempted to go with the Dvorak part, since they have a special "no leak" version.

What else is there that will be good for a race engine?

Thanks;

Mike