Well Voya, most of the kids on this forum have only seen RB20 cars, never driven, or they just listen to the other kids, I mean, 329 wasn't hard for me to make at 14 psi on my RB20. I mean we did do 280 at 14 psi with a S14 T28 on a redtop today, and feels good, just like a 329hp RB20, both are great motors.
You have lots of choices you can go with, this car gonna be for drag, drift, autocross, you worried about a couple of extra pounds under the hood?
I know you're looking for 300, so really any of the Nissan motors will be a viable decision for what you're looking for. Hell you could even drop a LS1 into it, that'll get you 350+ out of the box, and it's all aluminum, alot meaner than a SR. SR, RB20 will need a different turbo to make 300, the 25 will come close with the stock turbo, the 26 and VG30DETT, are already over 300. Hell go KA-T, more torque and power than the SR20 or RB20, and RB25, that's be different.
RB20 will be your cheapest route, just because the SR is more exspensive because of all the bandwagon kids jumping in and talking trash about the RB20, and saying SR20 this, so the exporters and importers smartened up and they know they can charge more for a SR20.
Just remember what Tran said, "a couple of SR's will pull a premium three weeks before race wars." for his Civics, HA.
If you give it some more time, Matt can jump on here and talk his shit about the RB20's and how fast his grandmas SR car is.
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