To refill an N2O bottle averages $3.50 per pound or $35.00 for a full 10 pound bottle. (Jarrett...I would be more than happy to fill your bottles. Will only charge you $70.00). If you decide to go .030 over on the block, you will also need .030 over pistons (if you want to go SC you need new Forged slugs anyway, figure $450.00). For a machine shop to bore your block it will be hot tanked $75.00, magged $75.00, line bored $60.00, they will check the deck $50.00, polish the crank or go .010/.010 grind on the crank $75.00-$100.00. New rings $100.00, bearings $50.00, gaskets $75.00, ARP rod bolts are $45.00, ARP main studs are $50.00, fresh fluids $50.00. Figure $450.00 to $500.00 for the machine shop work. If SC try to keep the CR at about 8.0 or 8.5/1. If you go nitrous CR is not as critical, as long as you use the right octane rated fuel, keeping in mind that those bottles will need to be refilled. To lower cost I invested in my own refill station for $350.00, but my cost per pound is about $1.95 as compared to $3.50. It was paid for after 10 weekends.