Well MD I can tell you an RS2000 with the Capri 3ltr Essex V6 goes pretty good, though at only 30 lbs or so lighter than a 302 Windsor V8 ... I should have stuck the eight in it ..
Ended up destroking it to a 2.7 ltr long rod motor.. due to new rego laws in NSW, big SS valve heads, Forged pistons, steel timing gears, 4 brl holley custom ally inlet ,custom stainless extractors, custom billet bisaloy flywheel, celica 5 sp, rear discs, holden lsd banjo diff center into escort housing ..LJ Torana axles, turreted and linked .. etc etc .. 210 kmh flat stick on Yokohama A008 shod Rebel race rims .... Dam I miss driving / racing this car .. Might have to pull it out of mothballs and rebuild it .