xr2 86-89=90bhp
xr2 84-86=96bhp
not up on my mk1's but mk2's ive had a few got 2 at the minute,finding a solid one is getting harder and as for price's depends you may get lucky and find one local to you cheap,but e bay is pushing the prices up imo,i payed £250 for my last one 68k vgc,covered 30k in it and never missed a beat,just bought another for £150 replaced a sill and went straight through mot,il be selling that soonish but il be asking around £800ish,hope this helps
one in mint condition on xrtwo.com at the min 48k fsh-£1800