I have a direct fire setup on my 3T-GTE. Though its in conjunction with an Autronic SMC and MSD DIS-4.
Basically I have a custom made trigger disc on the crank to supply the Autronic crank angle, and then used the gutted dizzy housing with a 1 tooth setup for reference signal.
Ignition outputs from the Autronic bridge into 4 channel MSD. So I can run all 8 plugs still in a waste spark setup.