noone bothers wireringing 205 blocks anymore, not on a stage 3 anyway. But if the grooves are there then fit new welding wire into them. Stage 3 is no problem for standard headbolts. By the way Group A h/gasket is exactly the same as standard cosworth h/gasket, 10 quid from woodfords, so save ur money. U gotta be careful bout keep skimmin the head cos ur raisin the compression ratio. Have u got an in car boost gauge? found out from who supplied the chip wat the max boost should be, cos stage 3s vary from suppliers.if ur heads flat, which it would be if it was skimmed, then maybe ur overboosting and/or runnin lean, which can cause the head to warp and result in a blown hgasket.