PI head/intake swap...that should be enough to purchase and have it installed.
lookhere for more info.
http://www.parkwayperformance.com/2vheadswap.asp
at this point this would be the best thing to do, then get some gears and exhaust, but until you upgrade to the PI parts those other mods won't add up to much. Once you get that 98 breatheing better everything from that point will be that much better.