CUTLASS SP2P carb options?

[WanaBa442]

So, been rethinking intake options for the Olds 260 as it comes out of hibernation in a few weeks.
Have a SP2P intake for it, new dual exhaust and a trans rebuild planned.
Looking at the SP2P I see it has a dual pattern carb mount on it.

The Holley 390cfm carb has been recommended as a good unit for this application, but then I saw this from Holley:
"This carburetor is calibrated for use on V-6 and small V-8 engines. This carburetor is a “square” flange carburetor and should NOT be used with adapters on “Spread-Bore” type manifolds, since adapters on may affect cylinder-to-cylinder fuel distribution. "

So now what? The floor of the SP2P is so flat any carb will need a spacer plate for the linkage to clear the intake.
Anyone done this, or run a spacer under a 390 Holley? I would think getting the carb up off the intake would add some plenum volume and actually create a better transition from the carb discharge area to keep fuel in suspension better than a plop onto a flat intake floor?
Other than a custom tuned quadrajet, what's a guy to do?
There's this: https://www.summitracing.com/parts/mrg-1932
which would make the two become one.

 

[DRIVEN]

Holley Economaster.

 

[pagrunt]

If it wasn't for the cost new I'd suggest a Holley 4175 spread bore.

 

[565bbchevy]

There's this: https://www.summitracing.com/parts/mrg-1932
which would make the two become one.

I would probably run this style so the intake divider stays intact and just trim the intake base gasket to fit.
https://www.summitracing.com/parts/edl-2696
Plus the one you posted is actually set up to run a quadrajet to a square bore intake.

 

[olds307 and 403]

The 390 should work with less restriction on that SP2P intake than a factory 4 hole iron intake. Use the Edelbrock adapter, probably the best one available.