IF you already have IDA's I personally see no point in going to IDFs.
The IDAs can in effect have in intermediate circuit created by adding another transfer slot hole to the carb.
In addition, if you are starting from scratch, electronic fuel injection would be the way to go.
The set up would cost about the same except for the addition of the CPU needed for the FI.
I suppose it all depends on how one conceives of the car as either an up to date ultra modern or a retro, period unit from the early 70s?
No matter which CARB system you choose, you still need to deal with the reversion in the carbs from the cam overlap. Not so on the FI.
Can someone explain what the mass is on the bottom of this manifold casting? To me it looks like an exhaust cross over plenum but there is none on this manifold.
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