+1 on springs.
Also, while youre in there changing the springs I would switch to hardened pushrods and roller rockers (pedestal-mount 1.7 ratio are good with the e-cam). If your budget allows of course. On that same condition, look for a set of heads (you can pick up gt40s for $300 on craigslist or ebay) and maybe an intake. Good luck on the cam swap!