Definately go with the compression. You will need a piston with at least 46cc dome to get that, but the power will be well worth it. I would also lean towards the Brodix 3xtra oval port heads if the budget allows it. A Brodix BM or Profiler Sniper manifold and a 1050 dominator will make more power than the 4150 series carb. I have all the parts in stock to do this combo at prices competitive to mail order. I also have a cam that will work, but you will have to call to get it. Can't give the numbers on here. Brad 864-578-5622 PAR Racing