You may simply lack the talent in your country to build a high horsepower 460 and a reliable C6. Sure a 460 is heavy but so is a "talldeck" big block Chevy. Both can be built to 632ci with an aftermarket block and make similar power.
'66 GT350H-3 time cover car - Car Craft July'77,Modified Mustangs and Fords Feb2011 ( w/article), Mustang Monthly June 2014. Bracket raced by me for the last 44 years. Yes it is a real one.
'68.5 R code GT fastback
'67 Ranchero 408W -427 glass hood
'78 F350 "Oleynik" car hauler
Ford Experimental parts collector