The question I have is why wouldnt you do everything possible to prolong the life of an expensive built engine? If its being low on cash just wait, save up for another few months and do it rite the first time. If you build for a goal of 450-600 you are always going to be limited to that... OVERBUILD now so you can grow if your power needs go up.. To me, boring,honeing,balancing, main studs, head studs,keying cam and crank should be on everyones list.. I kno boring isnt ness. but why not start with a brand new bore when your at the machine shop anyways?
So what happens when you break a crank 2 weeks after your over built engine is running?