Yes, for those who don't mind swapping out the manifold, a Holly 600 or
620CFM spreadbore on a dual plane manifold will yield more performance while
improving mileage a little over even the 2300 2bbl conversion.
GM
----- Original Message -----
> My 75 has a four barrel holley, also changed out the manifold. Beyond
that
> (like what model, etc.) I wouldn't know as yet, I've done very little to
the
> car but realign the driver's door. I plan to give my brick a tune-up soon
> so I'll know more when that is done.
>
> Jeff
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