Someone I used to ride with just had his engine hopped up. He said that it was a 421 or 420 but that it was on stock cylinders. He says it has a 4mm stroker and it has 44mm alky carbs. Out of frame drag pipes and undercut or override transmission with a lockup clutch. What kind of hp numbers are we talkin here, and how fast could it really be on a stock frame thats just lowered.