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I Would keep looking in ebay for a used Power FC
I got them before for $350
A rom tune still requires an SAFC. A power FC can work without an SAFC.
Therefore the price of Power FC is similar to ROM tune + SAFC and far more powerful.
These days using a high quality fuel injector you really want at least double size. So if you calculated that you need a 550cc then you should use a 1000cc injector instead. This way duty cycle is low (near 50-60%) at peak power, this will ensure more fuel is being sprayed during the appropriate window (valve event) and also keep the injector driver cooler.
So in the end using 550cc injectors and stock cams is "doing it wrong" you really need 700-1000cc injectors, 264+ low lift cams, and a fully tunable Stand-alone Power FC or similar
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