Igor,
My first conversion was a low budget project. I had a total of $1200 in it, though that was 1988 dollars. I started with a 77 Z with a bad motor, and a wrecked 77 Camaro Z-28. Everything for the conversion came from the Camaro; engine,trans.,radiator (re-cored to proper width 4core) accelerator pedal/cable, modified speedo cable, shortened driveshaft, etc. The JTR manual is a must. I made all the setback plates, spacers, trans. mount, etc. myself. Purchased parts were driveshaft yoke to differential flange, various fittings, 1/2" fuel line, electric fuel pump, block hugger headers, etc.
It's possible, just be a scrounger, and look for deals.