I’m pretty sure you know I’m not anti 318, but to me we’re not talking about 318’s a 390 isn’t a 318 anymore, your stated goal was low end torque aka displacement, to me we’re talking 365 vs 390 vs 408, a 365 can make decent low end but if more is needed/wanted than a 390 gonna make about 30 tq more and for similar price 408 will make 50 tq more than a 365, obviously there could be other factors but for the dollar per lbs-ft the 408 would be the wiser move. But if you chose 390 or even a 323 that’s up to you and I’ll try my best to help with whatever choice is made.