Absolutely you can get 80+ hp out of stock cylinders. I just figured you had a hard time getting good port work over there. I pretty well covered my set up. 35PWKs, I like the V2s over 3s (haven't tried out the 4s yet and 2s are harder to come by these days, 3s would be fine) pod filters., HJR aggressive dune port with a 4mil crank and weisco pisotns, cool head with cut domes at 185 static compression on 110 octane, shearer inframe drag pipes with a lock out clutch, billet basket and pancake bearing, stock flywheel with adjustable timing plate stock stator, with a dunable override. My drag bike is also stock cylinder 4mil with 40mm alky carbs running out of frame drag pipes. Prolly at about 100 hp.
It is all in the porting, tuning and matching the set up with components that compliment each other.
Good luck!
SP