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You can modify the opti to be vented. The vented cap will fit on the early optis or melt a hole in the cap and add a fitting. I drill one out one of the three holes on the base, add a fitting, and RTV the other two. I have done this with two '94 Camaro engines. There is a web site with photos somewhere...

I picked up a couple cheap used splined optis and replaced the cap. There is a risk the electronics are bad but the last time I looked the unvented Delco opti costs $100 more than the unvented. I once removed removed an opti from a running engine and put in another engine and it didn't work.
 
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