Power wise i believe around the 350 bhp level, but torque is the biggest rod threat. I would no exceed 330ft/lb on stock rods, 300 ft/lb will not kill the clutch either.
So i believe 300bhp @ 300 ft/lb all day long with no probs. No guarantees though as some engines have failed running stock unmodified power.
its a slippery slope my friend.
Labour Approx £400 - £500
Rods Approx £300
Shells & gaskets Approx £150
But if the head is off you may want to upgrade the valves, springs etc and maybe get the head proted etc.
The following are reputable tuners who can do this level of tuning.
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