Ok, I have a buddy with an 89 LX with Pulleys, LT headers, catback, o/r h-pipe, Cold air and a black magic fan.....We have to replace his heater tubes so we were going to swap out his stock intake for a tubular gt40 piece, he also has an E cam in the garage sitting around and was wondering if it would work with his stock heads, I said yes as I thought the rule of thumb was nothing over .510 lift, but he said he's heard no, it'll murder the stock springs