Can you put a aftermarket cone airfilter on the turbo of my 87 conquest or will it make the car run bad

There are several great threads about head flow & porting, however I have yet to see a truly bone stock set of SQ head flow #s with stock untouched valves. The #s floating around here by Krazed and Mike previously reported as stock are really not stock. I'm NO expert, but try to do my homework around here & simply curious that's all. http://www.starquestclub.com/forum/index.php?showtopic=36463&hl=%2Bhead+%2Bflow   I'm looking to compare what I have after my Marnal AMC head was por

87 Starion very rough and shaking at idle. Smooths out at 1500 to 2000 rpm. Any ideas?

so i pulled the head off of my 87 and started cleaning my block with 800 grit sand paper and found a crack bolt hole pass. side piston 3 im so bummed so now i need a block not mod. stock would like a long block ready to go but will accept any thing i can get   thanks