Julian,

5 stud:
doesn't look correct
most dependable (particularly for road use)
least expensive

Pin drive using adapters:
"correct look" until you take off your wheel
Not as dependable
Adds rotating and unsprung weight (the worst place to add it, slows acceleration and susp action).
Further offsets the wheels, affecting suspension geometry. This may or may not be a problem if you can correct with a different offset wheel.
From a mechanical standpoint this is the least desireable setup.
Considerably more Expensive

Pin drive, with true pin drive hubs:
"correct" look
Not quite as dependable, although if the spinner is wired they probably are.
No weight or geometry compromises.
Most expensive.

Mechanically the only reason for pin drives is quick wheel changes which your probably not going to see with a GT40 in this day and age, so aesthetics is the only reason to have them. Are you willing to pay 3-5K more so you don't see those 5 lugs, that's the question.

The original cars had 11" and 12" rotors. Anything over 12" is overkill unless your going to be doing some serious racing. In which case you could go to 13" on the front. Friend of mine vintage races a GT40 he runs 11" no problem. Nascar runs 12.5" on the fronts with different size calipers depending on the venue.

Don't forget bigger brakes adds unsprung and rotating weight so it's a compromise either way. A 13" rotor will typically fit in a 16" wheel depending on the caliper.

For my money the best calipers are the wilwoods, they have the best web site also. A aftermarket vette caliper is 150$ and the 4pot wilwood I got is 100$ plus it looks better than the vette.

One note the original cars didn't have e-brakes. You can set up a e-brake lever under the dash that pulls on the brake pedal, thus elimiating a lot of weight and expense. Don't know about the DOT inspections though.

[ January 03, 2002: Message edited by: Kalun D ]