It's pricey.

Major stuff needed.

Micro squirt $450
Dyna ignition $150
Injectors/throttle bodies gsxr 600 $100-300
Fuel pump $100


In addition to that you will need machined adapters or modify throttle body rack to fit cb750.

I would estimate that it would be all in $1,000-$1,200.

I have purchased everything to do a conversion but lack the time at the moment.