1. the Spitfire lower end would never hold up to the stress of sustained boost.
It's a matter of how much boost. It'll hold up just fine to mild boost.
2. engineering the fuel injection part of it would have been very expensive and
using a conventional carb would add to the problems of reliability due to the
lack of lubrication of the supercharger's pump.
Obtaining a Bosch L-Jetronic fuel injection system would cost no more then
$100.
It's well suited for blower use, and is regularly installed in such
applications by the
thousands nearly every day.
Carburetor use would not affect oil supply in any way, and is even easier to
install.
3. Obtaining a supercharger suitable for that particular engine was way too
expensive, not to mention fabricating an intake.
Fabricating the intake would take some work, but the V6 supercharger used by
Ford
is a good small size and available for a few hundred dollars regularly on e-bay
and in
junkyards. Turbocharger mounting is even easier and cheaper.
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