About the only thing you can do (you won't be able to see anything with the pan off), short of disassembly/inspection, is to check the compression in the rotor housings. The further the numbers are away from each other the more likely it is that there is something wrong. If you don't have a way of checking the compression, then the age old method of crossing your fingers and hoping for the best is the next step
Another option is to use the engine as a core and have someone rebuild it. Tony Rivera redid one of ours for about $1500.

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Nico
KCRaceware (816) 257-7305
[email protected]