Has anyone considered using a POSA style carburetor on their engine? I
recall the older Lake Injector carbs receiving their share of bad press due
to the sensitivity of the floatless system to head pressure. While this is a
problem on gravity feed fuel system, using a very low pressure (import type)
electric fuel pump would eliminate the tuning complications as fuel levels
changed.
To my understanding, here is a list of the core components needed for such a
system to properly work;

1) Either a AeroCarb (
http://www.aeroconversions.com/products/aerocarb/index.html) or Revmaster (
http://www.revmasteraviation.com/products/revflow_injector_carburetor/index.htm)
carburetor. Cost is $395 and $330 respectively.

2) Custom intake manifold. I can't really guess a price but since the POSA
style carbs can be mounted as downdraft, sidedraft or updraft, you would
have more design flexibility and potentially save some money.
3) Very low pressure electric fuel pump. Units like the Mr. Gasket 42S (
http://beta.summitracing.com/parts/MRG-42S/,) Professional Products 10701 (
http://beta.summitracing.com/parts/PFS-10701/) and Facet 40105 (
http://www.aircraftspruce.com/catalog/eppages/facetpumps.php) would work and
keep the costs reletively low at $37, $40 and $32 respectively.

4) Very low pressure fuel regulator such as the Mr. Gasket 9710 (
http://beta.summitracing.com/parts/MRG-9710/) for $26 or Holley 12-804 (
http://beta.summitracing.com/parts/HLY-12-804/) for $28.
This list excludes items such as fuel filters, gascolator, fuel lines, etc.
due to their universal nature.
Plumbing a carburetor heat system should be easier since the carb can be
mounted in different orientations and much less critical since POSA
carburetors lack venturi.
Vlad

We looked at it for a long long time.
They are very susceptible to vapor lock as the fuel pressure
is down around 1 psi. Even the VW guys don't recommend them any more :)
Go with a float bowl. Float bowl Carbs have it all. Mass airflow sensor,
fuel pressure regulator and fuel injector all rolled up into one :)

Paul Lamar