It is a TBI both Edelbrock and Offenhouser stoped making the four brl manifold , becides the holly 390 CFM is way to expensive.
Im the process of making my own low profile manifold .it's really not that hard , jus time and patience. So for now I have a Ford autolite two brl Carbonite with an adapter I made to fit , again not that hard ,just time and patience , An interesting thing is I was about to make the front fenders I went to a place called TRACTOR SUPPLY. They had fenders of all sizes for farm equipment and trailers ,I bought on , set on a wheel and laughed, it fit perfect so I cut it in half to make two , what a time saver that was
I haven't had it on the road yet but it runs so sweet , loud as a dragster it has no mufflers just straight pipes .But who cares , it's a racecar
By the way ,,,,,,, racecar spelled backwards is RACECAR