"I want a fast straight line car. Something that's able to put stock to mildly modded V8's in their place. But I also don't want a big lead sled. "
You may also want to consider a KA24DET. The additional displacement creates more torque than the SR at lower rpm. Many kits are available, but you can also build your own - less cash, more effort.
Both motors have pros & cons - just want you to be aware.
Jason at
www.unstable-hybrids.com has performed KA, SR and RB swaps. Drop him a line.
CB
PS. After seeing motors come in as "sets" and "front clips", I would recommend the front clip. Advantages: add battery and fuel tank to start it up - ALL the parts you will need - components typically better protected during trans-Pacific journey - sometimes you find "gems" still attatched (brakes,dash,steering wheel,gauges,etc) - you may get a glimpse of how the car lived and died via the chassis.