First off Welcome to BansheeHQ
Wow what a fuckin mess.
Pull the motor , open it up and start over. If it was me I would install a 4 mil crank assembly , find a decent set of stock cylinders, and replace the pistons with NEW ones. Keep your eye on the for sale section. There's great deals to be had here. Most of the sellers are trust worthy and offer good parts for great prices. Also follow the proper steps when reassembly takes place. ( Compression test , squish band , Leak down test ) Take your time and do it right the first time. If you need new parts contact the site sponsors here!
Personally I use Brandon @Wildcard Racing. 1-435-623-0148. He's a top builder with excellent customer service.
If you need any help just ask.
Once again,
Welcome
Troy