I,d like to keep my '84 corvette looking as stock as possible.but stretch H.P.to 300 to 350... Ihave my eye on a X-ram intake manifold comp. chip, borla exhaust. could someone tell me if switching to L98 aluminum heads are worth it or even possible? i've seen them on ebay for between 200 to 600 dollars a pr. that seems like a big upgrade for the money......thanks for any other ideas....