Trying to get more NA power, if you want to pass emmisions, I would recommend full port and polishing of your head, get type-r intake valves- they are cut back and cheaper than say skunks or whoever, use your stock exhaust valves, skunk: springs, retainers, and guides and skunk stage one cams best stage one power increases!!! get your intake matched or buy an aftermarket!!! use stock pistons and a thinner head gasket or type-r pistons for a little more cr. your bttom end is strong already, but it could use some miro-polishing and some balancing and definitely better rod bolts-ARP- have fun!!! stage two anything will make it difficult to pass emmisions!!! but they are lots of fun!!!!