Why don't we just do supra engine swaps? If you've actually seen these heads, you'd know that there is nothing stopping them from working properly. Does anyone even make a bellhousing that mates a volvo motor and a tremec? Look, It's just something to mess around with. If I wanted real power, I'd order a 4.0 inline six cylinder from Austraila and lay down 1000 hp. Haven't you ever tinkered with stuff till it worked and worked fine? or have you lost your roots and become a bolt-on-boy who can't do anything without calling up Stinkfinger.