77 911 SRC value - need insight

[J. W. H.]

1977 Porsche 911 Sunroof Coupe

Converted to a 4.3 Chevrolet engine with a kit from Renegrade Hybrid.

Has original Porsche 5-speed transmission, clutch and starter.

Engine is factory remanufactured long block assembly (Vortec). with an
Edlebrock aluminum intake and 4 barrel carburator. It has been run approximately 3,000 miles since installation. Cools properly in heavy city traffic as well as freeway travel. Even at 80+ mph.

Handles the same as a stock 911.

Very fast with lots of torque.

Body is straight and rust free.

Classic 5-spoke original Fuchs Porsche wheels.

Easy to convert back to original 911 engine using your 911 engine & oil
tank. The original oil cooler loop is still under the right front fender. The original air conditioning & evaporator are in the dash

This car has developed a typical 4.3 Chevy drive line vibration. Can you help me determine what it's worth as is and what it's worth less engine and conversion parts?

Thanks!