EFI is cool but expensive. I have almost $6K in the fuel injection for my twin turbo 455.
IMHO I'd only recommend a multipoint fuel injection system, I'd stay away from any form of throttle body injection.
I will also add that getting the fuel injeciton dialed in is a lot of work. Plan on spending at least 4 hours on a chassis dyno to get things running right.
As for cheap alternatives, the Holley and Edelbrock systems are likely to be the least expensive things out there.
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Twin Turbo Trans Am - 9.64 sec @ 148.51 mph, 3870 lbs.
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