I think that’d be a bit overkill to be honest. A 510 weighs less than an iPad last time I checked 
Nice, where is your shop? Can you post a pic or two? Are you guys doing anything for suspension and brakes?
V8’s (as pimpin as they are) you’re hacking the hell out of the car apparently plus I this all that weight in the front versus the tiny tin can car would take a lot of the fun out of it. The only thing I’ve really considered besides the SR is a VQ35. Its quite a tight fit but its possible. One fella has done it but not too neatly and another I know is working on it. I just don’t want to be hacking the car too much. Clearancing for a rad is one thing but taking a saw to the firewall is another.
good job
Amazingly clean, should be fun even with just a KA, it should be fairly balanced… Not too much power, just enough to be enjoyable to beat the piss out of!
Nice build man… There is nothing wrong with a sohc KA in there especially carb’d, it should sound very nice and will be really quick with the torque, and all the engine goodies you have on it. Once you drive it I wouldn’t be surprised if you get comfy with the KA.
Keep us updated!