Been hacking away at THUMPER forever but lately the results and issues I have found should help me fly...........5.95 is a stretch so I'll say 6.000 @ 112 w/a 1.31 60 ft.............I did drill relief holes and they helped but the faster we go the LESS air opening needed just look at an Indy car or old Pro stock cars. I may go w/a 2 1/2" cowl to stiffen the hood and the top will be the bottom in my case forcing the air right into the carb which I have seen done on some fast cars..............It is faster and smoother than ever so next thu. we'll see.........