My personal opinion is ditch the 440. Go with a 416 or 426. What i would do in your case is buy a sleeve from LA sleeves and have it put in your jug with a 426 bore. Send the jug off to snure interlocking and have gt thunder hd studs installed. Buy an 88mm piston kit with cometic gaskets. Wiseco,JE,or CP. I would also suggest you jet it correctly. And add a few extra cooling mods. Shrouds,fan on oil cooler, bigger oil tank. Something in that area. And you will have a good running quad for a long time.