funky fuel tank issues, guidance please

[littlevictories]

Let me give the back story.

I am using a spectra efi tank for a '69 camaro with a bosch branded 255 copy. ( I would do this differently if i did it again)

stock return style fuel system, to the rail and back again.

Initially I used an atmosphere-vented stock cap (for a '69 camaro) and all was good with the world. Then I switched to a locking cap for a '69 camaro and now I'm getting excess tank pressure.

Help me figure out a cool way to vent this puppy without it stinking like gas all the time.

I have considered cobbling the evap purge stuff together somehow.

or maybe just a cheap ebay rollover vent valve like this?

http://www.ebay.com/itm/AN6-6AN-AN-6...27a837&vxp=mtr


Help me Obi Wan