Trickflows are a great choice. I have a turbo 351 so not a direct comparison but when I switched from GT40s to 11r 190s it made a massive difference.
Unrelated to the engine. I weighed my stock 280z door today. Its gutted so I can paint them. so no glass, regulator, handle, lock, hardware, window frame ext. just a empty door shell. 34lbs.