Welcome to CHR Steve:

The fuel pressure for the TBI is between 12 and 15 psi – way too high for a carburetor. You’ll need a regulator to bring your pressure down to 5 psi - a fuel pressure gauge mounted near the carburetor is a good idea. On the sender unit, the fuel line is 3/8", the vent is 5/16" and the return is 1/4". The fuel and vent lines are re-used and the return may be capped.

Summit Regulator - SUM-G3131-1, $24.95 One in and two out ports (Carb and gauge, all 3/8" fittings)
Summit Oil-Filled Gauge - SUM-800130, $17.95



Others with far more experience here will chime in!

Good Luck,
Glenn