The 10mm or 1105cc will run $2295.00 for the cylinder kit and $450.00 for the case work which includes: epoxy work, case boring, and , porting, it is extencive work and I do all the work so I can make sure it meets my standards. The cases will also require a bottom plate which will run $not sure, about $100.00 a little less. So we are at $2845.00 A 10mm crank is price dependent on who you want to run. I will have a couple of options but I am working on prices right now, but figure $1200-$1400.00 If you need cases you need a good set, you don't want to just run any set, you will want a set with good bearing surfaces and good overall condition. I will have some new cases in and those will run about $535.00. Don't forget seals, I like OEM, about $40.00 ish. So you looking at roughly $4820.00 and I said roughly. This is for all new parts, not used. As you can see there may be some wiggle room. As far as what can be used from a 61x, ignition, crank, that may be all. When you say flat-water AIR I'm not sure what you mean, (back flip?) I can only give you power, how you use it is up to you.