My project is very similar to yours . Fortunately , the Z28 i bought not as bad as yours . I use full Z28 driveshaft with JTR adapter , shortened and balanced costed me $85 ) . Here's the Z28 i got for $1900 ( 60k miles ) , after taxes , fees = $2500 . Sold the car for $725 and still have wheels , tires , and a set of full length ceramic coated headers ( haven't sold them yet ) . I reworked the OE harness with Ebay ECM ( $125 ) .