Unless it was converted that would require a 2-hose pressure tank. Do you have a fuel tank for it? After 44 years, few of these tanks are still usable unless all of the gaskets and hoses have been replaced. They need to seal perfectly so they can hold the pressure needed to pump gas to an engine that doesn't have a fuel pump.
The second issue is that the coils in that era didn't last too long. Take a look - if they are coated in clear lacquer they likely have not been replaced.
They are good running motors if they have been upgraded. Loud and smokey, but they last forever. The oil ratio is 24:1.
Asking prices are all over the map. Selling prices reflect what people are willing to spend. Its a common motor, so not highly collectable.
$200 if complete and in running condition. A tank upgraded to E-10 standards should go for about $50. I have 2 of them, both needed coils and hoses, and I paid 20 bucks for each. One had no tank and the other came with 2 tanks.