I toyed with the idea of twin TBIs, there is just too much to doing that
being the coolant runs through the intake, and what about the throttles
and the plumbing to get it all working .... Ugg
The stock TBI injector is not a stand alone, it needs the throttle body to
hold the fuel presure around it, being it's a "side feed" type.
Replacing the stock TBI with 2 added injectors solves this trouble, and if
wanted, you could use the stock TBI to inject water or alcohol or a mix
for detonation control under boost conditions
I added 4x17 PPH injectors from a Ford Escort, these with the stock TBI
all injecting was a powerful mix, near dead on for power but the 4 added
injectors were wide open, so even a pair of 55s might be not enough, but
I would start there, and move up to 58s or 60s as you tune the system
Wild