Hello mate

just quickly, if you are planning to go big brakes on your series one, id allow a bit of budget to uprate the master cylinder, and possibly the brake servo aswell.

Ive just converted my MK3 cabby to a full 2wd set up, 4 pots and disc conversion, and the master cylinder isnt really up to the job its on the limit, you need a lot more fluid pushed through, so there is a lot of travel in the pedal.

That said its mainly rear disc conversions that cause the trouble, but i would presume you are going to convert the rear aswell?