i take it this is for either a dyno pony, or the car is destined for the dump.
and that you plan to give the car a hiding.

when you say engine life, ill assume that everything else will cope with the extra torque and HP? else id bet a another part of the drive line will fail.

for such short engine life, you wouldnt bother with any special internals. you could just gamble with any old smoker, although a good internals will give you better tunability. eg better heat management,

max HP its hard to say,but my guess around 120hp before things go to custard real quick