Purging sealed fuel tank to Ls engine

[cerial]

I have a 87 square body V10 with the stock equipment that I am currently running around in.

I pulled the saddle tanks and installed a 72 in cab eec sealed tank that vents to the current 87 charcoal canister and the fumes are pulled into the throttle body when that purges.

I am using the 72 vent style lines which allows for some fun off camber angels without any need for a roll over valve or to think about fuel spilling. The cap is basically a alum plug that turns then you push a tab down to seal it.



The tank gravity feeds to a pre filter, walboro pump, post filter then goes up to the regulator before going back and returns to the tank through the old 72 feed line running without the sock.

Been running this for the last couple months without a issue

I picked up a 02 5.3 truck ls engine with everything. All the accessories and a uncut harness with the computer.
Going to remove the vats and flash that then run it all 2 wire style running the orlieys ps hoses and flywheel with ls7 bearing to a sm465 brownie then 205.

But I need to vent that tank somehow. Now I live in a non emissions state so I could just vent the thing to the atmosphere. But if possible I would like to run a purge. So would it be best to use the 87 canister and have that purge into the intake of the ls blocking the ls purge or use the ls purge and remove the purge valve from the 87 canister?

I would like to activate the purge valve using my break light switch. Just have it open every time I hit my breaks activating a timed relay for 2 or so seconds pulling that pressure out of the lines and into the intake.

But if I could use the factory ecm to open that on decel that wont make a vacuum leak so looking on advise on this.