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GT28Rs will not make 300whp on pump gas without VE modifications like cams (and even then it might be iffy). The GT28RS does not need 550cc injectors unless you run race gas and over 20 psi. 440's, a Walbro pump, and an ATS FPR are PLENTY of fuel for a pump gassed GT28RS.
The CT27 is 90% the same performance as a GT28RS. If that 10% is worth the extra $1000 them go for it. Personally I think the GT2871 is good option.
Aaron
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