300/440/550 550 Engine Build..

[Js_440_78]

So im maybe thinking of swapping over the 440 engine to a 550 engine.. i all ready have:
- 550 barrel and head (do you think that it has to much rust in the cylinders, would it be able to be honed out?)
- 550 carby and intake
- hull with good jet and brand new berings

i can get a bottom end with stator and starter motor and it has 5 hours on it and then all i would need is gaskets, pistons and rings..

The thing i need help with is to try and see if the barrel would fit on it.. im not sore wat year its off and i dont no weather its reed engine or not.. the only thing that i know is that the bottom end is a 88 Sx. Can you tell from these pictures weather or not its a reed engine and weather it would fit onto the 88 sx bottom end?
thanks for the help

 

[tj1820]

i do beleive that top end is for a pp 550! and if so no u can not us the sx bottom end! can someone else verify this plz!

 

[Talsivar]

the top end pictured is a piston port. there was no sx in 88 90 was the first year of the sx and 91 was the first reed 550 motor.

 

[Motorheads5]

It is hard to tell how bad the rust is from the pictures spray them down with penetrating oil of some kind and clean them up with a scotchbrite or steel wool if you don't have pitting then you will be ok. good luck