It may can be done with offset TBI adapters, one two barrel at rear of back carb flange and one at front of forward flange. Holley list #6425 650 CFM two barrels would be an option but for a comparable four barrel flow of 919 CFM. That would probably get the most potential from the manifold for drag strip usage, being somewhat of a “full blast set-up” . A more attractive option for street driving would be a pair of FI tech or holley two barrel TBI units, but would be more of a visual appeal kind of thing. Like I say often “it would be awful to have any real money” ... just too much stuff and so little time!
