Hey "Rick" when ya get to it, let me know and maybe by then I'll have drilled my jet out and can let you know what size drill/jet will do the trick. I believe the high speed jets are a #70 stock and some of the racing websites say they've had best luck going to #80 up to a #90 depending on if you've opened up the exhaust, 16lb valve springs, timing advance woodruff key, better flywheel, smaller fan, etc... Maybe open up the low speed jet just a tiny bit also, but can't add too much cause the air bleed is "fixed" I'm leaning towards just a "hop-up kit" rather than a stage 1 kit for now. I found some 1" pipe in our shop today for the exhaust, but have to wait till motor is "in" to figure out what I'm going to do. (muffler/no muffler for back pressure and number of bends, etc...I'm thinking a "fishtail tip" would look retro on it tho.