I have a 2.1 pinto on 48's with headwork/cam/ARP bolts/Lumenition etc in my mk2 rallycar, it goes onto the rolling road on thursday so I'll let you know what it does.The Quaife box and Atlas rear axle are deafening though and would be no good for a road car though, but if you want reliablity (and bearing in mind the rally on the 7 december at Longcross has a £195 entry fee,so if you brake down on the first stage you'll be pretty pissed off!!!) then it's the only way to go!
Keep it pinto.
Cheers, Andy