Super Jet RIVA cylinder markings

I picked up a motor recently and noticed various RIVA markings on the cylinder and it had a RIVA head on it with a dual 44 intake manifold. Does anyone know what these markings mean?

Also, the guy said it was a 650 motor and I noticed it has 6m6 crank with a 61x top end, so is it a 701 and is it bad to mix and match or should it be fine?

didnt look at the exhaust to check for Porting.

I got a skat trak 11/19 prop and was trying to do some research on it but it seems like a prop for racing rather than freestyle? Anyone know anything about these

Anything else I should look for?

Thanks for the help
 

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