I am running a EightStack (Borla Weber look-alikes) on my FE. Performance Electronics does the ECU & associated electronics. Very pleased with the system. The only drawback is the complete package can get a little pricey.
Joe Average can't tell the difference from 48IDA's, starts like a modern day Mustang and I got 17MPG cruising last fall on numerous trips.
It's a 390 based 432" w/ hydraulic roller & Edelbrock heads.