Thought a few extra tips might help from my own Griffin install. Like you, I was extremely reluctant to put any sheet metal screws into my expensive radiator, push any plastic straps through it, or use insufficient cushioning that would allow it to contact the frame, or the fan.
Went to the hardware store and got some lengths of steel wall shelf attachment chanel. (The steel has a round "U" shape on the wall side) The part that goes against the wall. Cut them in short lengths, 4 pcs, rad to rad frame, and 4 pcs, fan mounting bracket to rad. Used Devcon epoxy to hold the pieces to the rad. (PC7, or PC11. Installed inner fender liners, fuel cap frenching, and other hi strength jobs with this stuff too.)
Bottom rad support had a front to rear piece of wall bracket supporting the rad at the rubber cushon forming the lower mount. Left as is, the sharp edges of the rad would cut through the rubber mount.
Sheet metal screws can then be used to hold the fan mounting bracket to the supports you just installed on the rad. I used (hardware store) foam weather stripping on the fan bracket over the rad so it wouldn't vibrate or bang against it.
The bracket I used allowed me to adjust the verticle position of the fan. The fan is scrunched between the steering rack on the bottom, and the hood mounting bracket on top. You may have to shave a bit of the upper fan shroud for hood bracket clearance.
Used a Ron Francis Wireworks (
www.wire-works.com) thermostat and relay setup to control and juice the fan. Put the fan sensor right over the driver side water exit from the head to the intake, in the intake. Using a 180 thermostat, fan comes on at 200, goes off at 185. Used the air conditioning control for a dash mounted override switch for hot days and slow traffic. Using a Stant 7# pressure cap.
$15 Trak/Pep Boys coolant overflow keeps air out of the radiator, and coolant off your garage floor.
Used 1 3/4" exhaust tubing for part of the lower water crossover, along with 90 deg elbows.
5000 miles now on car, cooling system works fine (knock on wood).