Re: 240z -Chevy 350 conversion, how difficult?
1 The job isn't all that difficult if you buy your motor mounts, and other swap necessities already pre-fabbed from a company like Jags That Run. They print a great swap manual that has clear and concise instructions.
2 Kinda like asking how much a paint job will cost,,,,,anywhere from $500 if yopu have the motor/parts and do it yourself, up to $10,000+ if you buy a crate motor and have someone do it for you.
4 Mileage should actually increase a bit with correct gearing.
5 Chevy 350 is the easiest to find/buy and is the most popular, so aftermarket will be plentiful, and experienced swap help will be available. If I were to do a swap, I would go with a Ford 5.0 from a Mustang GT.
6 If you are looking for more power and speed, check into a turbo swap for the inline 6.
1971 240Z series 1 with a 22,000 serial#, all original and 99% rust free.
I no longer have the black bumperless 78 with the ZX drivetrain.