Do you really believe a V8 is cheaper? I have built many 6s for people . Last one was for a 39 Chev coupe and replaced a 305 V8. owner says he gets rubber in alll three gears. Far mor power than the V8 and wonderful gas mileage.
Talk to him if you like. His name is Len and he can be found at "lencol@aol.com" It was a 250 6 cylinder BTW.