Maverick engine in a G1…….few questions on parts

A buddy of mine (and possibly me!) is considering swapping out his 800 engine for a Maverick 1000 engine. I am sort of in charge of this, and trying to gather as much info as possible.

I realize the exhaust has to be modded, head has to be machined for cam sensor, ECM reflashed, and a tuner to control fuel, flywheel from the 800 engine.

The intake is the issue……is there any chance the intake manifold & throttle body off a new 1000 engine would work on the Maverick engine? And is there anyway this would still line up with the stock G1 airbox? Or is there only 1 option, and thats a complete custom aluminum piece?

Any other suggestions? And we’ve already been down the road of BBK/etc., and he is not interested in that,