656delta,
I wouldn't get that radiator. Spend the money on a good radiator and it will last awhile. I'm running a prc radiator part number 2111100 24x19. http://www.prcracing.com/aluminum-radiators.html I know it was less than 275.00 shipped to me. I'm also using a ford taurus cooling fan which works perfect and they can be picked up for less than 50.00 bucks shipped. It keeps my 1JZ cool even in the Georgia summers. I had a couple spal fans and those things didn't flow enough air. My temps would creep up in traffic. I junked those spal fans and modded a taurus fan with a thermostat and it works perfect.. The toyota 1JZGTE's have the same cooling problem's as the RB motors.
As for the coolant water neck if you were closer to me I would say come on over and I'll weld it up for you but California is a bit far. lol