Engineers certificate definately. Axle bearing retainer plate may have to be changed, source new brake lines and brake pipe to suit. The TA22 Master and booster should be fine, however you may like to swap it for an RA23/28 unit. The brake bias can be sorted by cutting 2 coils from the spring in the bottom of the brake fluid distribution block. (mounted on the firewall). My son and I have used Corona Avanti rear discs on a TA22 and an RA23, the only other thing other than what has been mentioned, is that we had to move the shocky mount on the diff housing inboard by 25mm.