Nice little GT! As for brake upgrades, i think Opel Omega MV6 brakes fit up front, with some modifications (enlargen the centre hole on the disc, and redrill it to 4x98mm, and i think you`d need to make some sort of spacer for the caliper) The Omega MV6 is the same as the Cadillac Catera over there, so shouldnt be too hard to find? I also see several cheap brands making brake kits that fit Opel Ascona\Kadett, but they tend to be pricey.... Got a Omega brake set for the front of one of my cars for a couple of hundred bucks, including steel braided brake hoses
PS! The bolts for conrods seem to be kinda crap on old CIH engines like you have, so if they havent been changed, i`d go for ARP replacements 
Shameless whoring of my Opel


Shameless whoring of my Opel


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